Charge and Current

Question 1

Flashcard 1
Q → What is electrical charge and how does it relate to circuits?
A → Electrical charge is a property of matter that allows it to experience a force when placed in an electric field. A circuit works when charge is allowed to flow through it, enabling the transfer of energy.

Flashcard 2
Q → What types of particles usually carry electrical charge in a circuit?
A → Electrical charge is usually carried by free-moving electrons or ions, which move through the circuit and allow current to flow.

Flashcard 3
Q → What is the unit of electrical charge?
A → Electrical charge is measured in coulombs (C).

Flashcard 4
Q → What is charge as a physical property of matter?
A → Charge is a property of a body that causes it to experience a force when placed near another charge or in an electric field. It exists in two forms: positive and negative.

Flashcard 5
Q → How do charges interact with each other?
A → Charges exert forces on each other. For example, a negative charge will repel another nearby negative charge, demonstrating that like charges repel.

Flashcard 6
Q → What role do electrons play in electricity?
A → Electrons are negatively charged particles that move through wires, transferring energy in the form of electricity.

Flashcard 7
Q → Why is charge often described in “packages” rather than individual electrons?
A → Individual electrons are extremely small and have very little effect on their own, so it is more practical to refer to large groups (packages) of electrons when discussing charge.

Flashcard 8
Q → How many electrons are in one coulomb of charge?
A → One coulomb of charge is equivalent to approximately 6,250,000,000,000,000,000 electrons.

Flashcard 9
Q → What is electric current?
A → Electric current is the flow of electric charge through a circuit.

Flashcard 10
Q → How is electric current defined in terms of charge and time?
A → Electric current is defined as the rate of flow of electric charge, meaning how much charge passes a point in a circuit per unit time.

Flashcard 11
Q → What is the unit of electric current?
A → Electric current is measured in amperes (A), often shortened to amps.

Flashcard 12
Q → What does one ampere represent?
A → One ampere is the current that flows when one coulomb of charge passes a point in a circuit in one second.

Flashcard 13
Q → What is the equation linking charge, current, and time?
A → The relationship is given by: charge = current × time, or Q = It.

Flashcard 14
Q → What do the symbols in the equation Q = It represent?
A → Q represents charge (in coulombs, C), I represents current (in amperes, A), and t represents time (in seconds, s).

Flashcard 15
Q → How does current behave in a single closed loop circuit?
A → In a single closed loop, the current has the same value at every point in the circuit.

Flashcard 16
Q → In which direction does conventional current flow in a circuit?
A → Conventional current flows away from the positive side of the cell (the longer line on the circuit symbol).

Flashcard 17
Q → What are the two types of electric current?
A → The two types of current are direct current (DC) and alternating current (AC).

Flashcard 18
Q → What is direct current (DC)?
A → Direct current is the movement of electric charge in one direction only, with electrons flowing consistently in the same direction around the circuit.

Flashcard 19
Q → What is alternating current (AC)?
A → Alternating current is an electric current that regularly changes both its direction and its size, meaning the flow of electrons continually reverses.

Flashcard 20
Q → What must be present for current to flow in a circuit?
A → A current will only flow in a complete (closed) circuit if there is a potential difference provided by a source.

Flashcard 21
Q → What happens when current flows in a circuit?
A → When current flows, electrical work is done and energy is transferred through the circuit.

Flashcard 22
Q → How does the size of current relate to the flow of charge?
A → The size of the current represents the rate at which charge flows; a larger current means more charge passes a point each second.

Flashcard 23
Q → How does current affect the amount of charge passing through a circuit?
A → More charge passes through the circuit when a larger current flows, especially over a given period of time.

Flashcard 24
Q → How does resistance affect current in a circuit?
A → The greater the resistance of a component, the smaller the current that flows through it for a given potential difference.

Flashcard 25
Q → What determines the current flowing through a component?
A → The current through a component depends on the potential difference across it and the resistance of the component.

Flashcard 26
Q → How is current measured in a circuit?
A → Current is measured using an ammeter.

Flashcard 27
Q → How must an ammeter be connected to measure current through a component?
A → An ammeter must be placed in series with the component to measure the current flowing through it.

Answer 1

Source 1: Electrical Charge and Current:
ELECTRICAL CHARGE (Q):
A circuit works when CHARGE is allowed to FLOW through it.

Usually these charges are free moving ELECTRONS or IONS.

Units: COULOMBS (C)

ELECTRIC CURRENT (I):
ELECTRIC CURRENT is the FLOW of electric CHARGE, quantified by the amount of charge passing a point in the circuit over time.

One of the key characteristics of current in a single closed loop is that it has the SAME VALUE at any point in the loop.

Units: AMPERES (A) ||| Current always flow AWAY from the POSITIVE side of the cell (the LONGER line)

The relationship between charge flow, current, and time is expressed by the equation: Charge = Current × Time

(short-hand form: Q = It), W=where:

Charge flow (Q) is in Coulombs (C).
Current (I) is in Amperes (A); “Amp” is also acceptable.
Time (t) is in Seconds (s). ////////// Source 2: Electrical charge and current:
There are two types of current (moving electric charges, e.g: electrons moving through a metal wire): direct and alternating. In a direct current (which is the movement of charge through a conductor in one direction only), the flow of electrons is consistently in one direction around the circuit. In an alternating current (which is an electric current that regularly changes its direction and size), the direction of electron flow continually reverses. ||| Charge:
Electrons are negatively charged particles and they transfer energy through wires as electricity.

Charge (which is a property of matter that causes a force when near another charge. Charge comes in two forms, positive and negative. For example, a negative charge causes a repulsive force on a neighbouring negative charge) is a property of a body which experiences a force in an electric field. Charge is measured in coulombs (C).

Since electrons are so small and one electron will not have much of an effect anywhere, it is more useful to refer to packages of electrons. One coulomb of charge is a package equivalent to 6,250,000,000,000,000,000 electrons. ||| Current:
Electrical current is the rate of flow of electric charge.
When current flows, electrical work is done and energy transferred. The amount of charge passing a point in the circuit can be calculated using the equation:

charge = current × time (short-hand form: Q = It), and this is when:

charge (Q) is measured in coulombs (C)
current (I) is measured in amps (A)
time (t) is measured in seconds (s)
One amp is the current that flows when one coulomb of charge passes a point in a circuit in one second. ||| Measuring Current: Current is measured using an ammeter. To measure the current through a component, the ammeter must be placed in series with that component. ////////// Source 3: Current is the Flow of Electrical Charge:
Electric current is a flow of electrical charge. Electrical charge will only flow around a complete (closed) circuit if there is a potential difference, so a current can only flow if there’s a source
of potential difference. The unit of current is the ampere, A.
In a single, closed loop, the current has the same value everywhere in the circuit.
The current flowing through a component depends on the potential difference across it and the resistance of the component. The greater the resistance across a component, the smaller the current that flows (for a given potential difference across the component). ||| Total Charge Through a Circuit Depends on Current and Time:
The size of the current is the rate of flow of charge. When current flows past a point in a circuit for a length of time then the charge that has passed is given by this formula:
charge = current × time (short-hand form: Q = It)
More charge passes around the circuit when a larger current flows.

Question 2

Flashcard 1

Question 3

Q → What is electrical charge and how does it relate to circuits?

Question 4

A → Electrical charge is a property of matter that allows it to experience a force when placed in an electric field. A circuit works when charge is allowed to flow through it

Answer 4

enabling the transfer of energy.

Question 5

Flashcard 2

Question 6

Q → What types of particles usually carry electrical charge in a circuit?

Question 7

A → Electrical charge is usually carried by free-moving electrons or ions

Answer 7

which move through the circuit and allow current to flow.

Question 8

Flashcard 3

Question 9

Q → What is the unit of electrical charge?

Question 10

A → Electrical charge is measured in coulombs (C).

Question 11

Flashcard 4

Question 12

Q → What is charge as a physical property of matter?

Question 13

A → Charge is a property of a body that causes it to experience a force when placed near another charge or in an electric field. It exists in two forms: positive and negative.

Question 14

Flashcard 5

Question 15

Q → How do charges interact with each other?

Question 16

A → Charges exert forces on each other. For example

Answer 16

a negative charge will repel another nearby negative charge

Question 17

Flashcard 6

Question 18

Q → What role do electrons play in electricity?

Question 19

A → Electrons are negatively charged particles that move through wires

Answer 19

transferring energy in the form of electricity.

Question 20

Flashcard 7

Question 21

Q → Why is charge often described in “packages” rather than individual electrons?

Question 22

A → Individual electrons are extremely small and have very little effect on their own

Answer 22

so it is more practical to refer to large groups (packages) of electrons when discussing charge.

Question 23

Flashcard 8

Question 24

Q → How many electrons are in one coulomb of charge?

Question 25

A → One coulomb of charge is equivalent to approximately 6

Answer 25

250

Question 26

Flashcard 9

Question 27

Q → What is electric current?

Question 28

A → Electric current is the flow of electric charge through a circuit.

Question 29

Flashcard 10

Question 30

Q → How is electric current defined in terms of charge and time?

Question 31

A → Electric current is defined as the rate of flow of electric charge

Answer 31

meaning how much charge passes a point in a circuit per unit time.

Question 32

Flashcard 11

Question 33

Q → What is the unit of electric current?

Question 34

A → Electric current is measured in amperes (A)

Answer 34

often shortened to amps.

Question 35

Flashcard 12

Question 36

Q → What does one ampere represent?

Question 37

A → One ampere is the current that flows when one coulomb of charge passes a point in a circuit in one second.

Question 38

Flashcard 13

Question 39

Q → What is the equation linking charge

Answer 39

current

Question 40

A → The relationship is given by: charge = current × time

Answer 40

or Q = It.

Question 41

Flashcard 14

Question 42

Q → What do the symbols in the equation Q = It represent?

Question 43

A → Q represents charge (in coulombs

Answer 43

C)

Question 44

Flashcard 15

Question 45

Q → How does current behave in a single closed loop circuit?

Question 46

A → In a single closed loop

Answer 46

the current has the same value at every point in the circuit.

Question 47

Flashcard 16

Question 48

Q → In which direction does conventional current flow in a circuit?

Question 49

A → Conventional current flows away from the positive side of the cell (the longer line on the circuit symbol).

Question 50

Flashcard 17

Question 51

Q → What are the two types of electric current?

Question 52

A → The two types of current are direct current (DC) and alternating current (AC).

Question 53

Flashcard 18

Question 54

Q → What is direct current (DC)?

Question 55

A → Direct current is the movement of electric charge in one direction only

Answer 55

with electrons flowing consistently in the same direction around the circuit.

Question 56

Flashcard 19

Question 57

Q → What is alternating current (AC)?

Question 58

A → Alternating current is an electric current that regularly changes both its direction and its size

Answer 58

meaning the flow of electrons continually reverses.

Question 59

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Question 60

Q → What must be present for current to flow in a circuit?

Question 61

A → A current will only flow in a complete (closed) circuit if there is a potential difference provided by a source.

Question 62

Flashcard 21

Question 63

Q → What happens when current flows in a circuit?

Question 64

A → When current flows

Answer 64

electrical work is done and energy is transferred through the circuit.

Question 65

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Question 66

Q → How does the size of current relate to the flow of charge?

Question 67

A → The size of the current represents the rate at which charge flows; a larger current means more charge passes a point each second.

Question 68

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Question 69

Q → How does current affect the amount of charge passing through a circuit?

Question 70

A → More charge passes through the circuit when a larger current flows

Answer 70

especially over a given period of time.

Question 71

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Question 72

Q → How does resistance affect current in a circuit?

Question 73

A → The greater the resistance of a component

Answer 73

the smaller the current that flows through it for a given potential difference.

Question 74

Flashcard 25

Question 75

Q → What determines the current flowing through a component?

Question 76

A → The current through a component depends on the potential difference across it and the resistance of the component.

Question 77

Flashcard 26

Question 78

Q → How is current measured in a circuit?

Question 79

A → Current is measured using an ammeter.

Question 80

Flashcard 27

Question 81

Q → How must an ammeter be connected to measure current through a component?

Question 82

A → An ammeter must be placed in series with the component to measure the current flowing through it.