Physics-Electricity

Question 1

Define

Electrons

Answer 1

A subatomic particle with a negative electric charge

Question 2

Define

Electrcity

Answer 2

What powers appliances

Question 3

What are the three main charges a atom can possess:

Answer 3

• Postive
• Negiative
• Neutral

Question 4

What are the three main charge rules?

Answer 4

• Opposite attract
• Like repel
• Neutral do nothing

Question 5

What charge are:
* Electrons
* Protons
* Neutrons

Answer 5

• Negiative
• Postive
• Neutral

Question 6

Unit for

Charge(Q)

Answer 6

Coulomb

6,240,000,000,000,000,000 electrons worth of charge

Question 7

State the formula that links charge flow (Q), current (I), and time (t).

Answer 7

The formula is Q=It.

Question 8

What does Q repersent in Q=It?

Answer 8

Charge

Question 9

What does I repersent in Q=IT

Answer 9

Current

Question 10

What is required for a current to flow?

Answer 10

A potential difference

Question 11

How does the value of current vary in series?

Answer 11

Current in series is the same everywhere.

Question 12

How does the value of potential difference differ in a series circuit.

Answer 12

p.d is the same everywhere in series.

Question 13

Define

Static electricty

Answer 13

A build-up of electrical charge on an object, which can be either positive or negative.

Question 14

Define

Electric Current

Answer 14

Electric current is the rate of flow of electrical charge around a closed circuit.

Question 15

Define

Electric Circuit

Answer 15

An electrical circuit is made up of components, which are connected together using wires.When currents are put into a loop, with a battery pushng it around

Question 16

Define

Circuit diagrams/symbols

Answer 16

A efficent way to repersent circuits

Question 17

Define

Components

Answer 17

A part of a circuit

Eg. A battery, motor, lamp, switch or wire.

Question 18

Define

Potential difference

p.d

Answer 18

How much electrical energy each electron possess in a part of the circuit.

High voltage:More energy
Low voltage:Little energy

Question 19

Define

Ohms/resisitance

Answer 19

How easy it is for a current to pass through a wire

High resistance:High Loss of energy
Low resisitance:Low loss in energy
Semi-conducting:Negible energy loss
Superconducting:No loss in energy

Question 20

Define

Ohmic conductor

Answer 20

Conductor where current and resistance is dierectely proportional,at a consant temperature

Question 21

Describe

IV graph of lamp

Answer 21

The graph is curved, showing that as potential difference increases, the resistance aslo increases, due to an increase in ntemerature, resulting in decrfease of rate of current.

Question 22

Describe

IV graph of Diode

Answer 22

Current only flows in one direction with a high resistance in then other

Question 23

How does resistance of a thermistor chage with temp?

Answer 23

As temperature increases, resistance decreases

Question 24

How does resistance of a LDR change with light intensity

Answer 24

As light intensisty increases, resistance decreases.

Question 25

# FORMULA Resistance in series

Answer 25

R (total)=R1+R2...

Question 26

# Define Amps

Answer 26

How much charge passes a specifc point in a second

Question 27

What is the relationship between voltage,current and resistance?

Answer 27

V = IR

Question 28

What does V repersent in V=IR and what is it's unit

Answer 28

Potential difference, meausured in volts

Question 29

What does R repersent in V=IR, and what is its unit

Answer 29

Resistance, meausured in ohms(Ω)

Question 30

In a circuit where potential difference is the same, what happens to current with more resistance?

Answer 30

With more resistance there is less current.

Question 31

# differencee betweeen * Series * Parrell

Answer 31

* One loop circuit * Multi-loop circuit

Question 32

# Define AC current

Answer 32

A current that can be alternated(switch dierection) with the use of electromagnets

Question 33

# Define DC current

Answer 33

A current that is one-way but far more powerful

Question 34

# Define Electrical appliances

Answer 34

Devices that use electrical energy to perform specific functions, typically found in homes and workplaces.