Test > physics topic 2 - electricity > Flashcards

physics topic 2 - electricity Flashcards

(82 cards)

Study These Flashcards
1
Q

Define electric current.

A

The flow of electric charge, measured in amperes (A).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the unit of voltage?

A

Voltage is measured in volts (V).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

True or false: Resistance opposes the flow of electric current.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Fill in the blank: Ohm’s Law states that voltage equals current times _______.

A

Resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the formula for power in an electrical circuit?

A

Power equals voltage times current (P = VI).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define series circuit.

A

A circuit where components are connected end-to-end, so current flows through each component.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What happens to total resistance in a series circuit?

A

Total resistance increases as more resistors are added.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Define parallel circuit.

A

A circuit where components are connected across common points, allowing multiple paths for current.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens to total resistance in a parallel circuit?

A

Total resistance decreases as more resistors are added.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is electrical energy measured in?

A

Electrical energy is measured in joules (J).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

True or false: Insulators allow electric current to flow easily.

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Fill in the blank: A battery converts _______ energy into electrical energy.

A

Chemical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the function of a fuse?

A

A fuse protects circuits by breaking the connection when current exceeds a safe level.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define conductors.

A

Materials that allow electric current to flow easily, such as copper and aluminum.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is static electricity?

A

The buildup of electric charge on the surface of objects.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

True or false: Voltage is the same as electric current.

A

FALSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Fill in the blank: Capacitance is the ability of a component to store _______.

A

Charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the unit of capacitance?

A

Capacitance is measured in farads (F).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Define electromagnetism.

A

The interaction between electric currents and magnetic fields.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is a transformer used for?

A

To increase or decrease voltage in an alternating current (AC) circuit.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

True or false: AC stands for alternating current.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Fill in the blank: DC stands for _______ current.

A

Direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the primary purpose of a circuit breaker?

A

To automatically interrupt the flow of current in case of overload.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Define Ohm.

A

The unit of measurement for electrical resistance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What does a **voltmeter** measure?
A voltmeter measures the voltage across two points in a circuit.
26
True or false: **Ammeters** measure voltage.
FALSE
27
Fill in the blank: The **total current** in a series circuit is _______ through all components.
The same
28
What is the role of a **switch** in a circuit?
To open or close the circuit, controlling the flow of current.
29
Define **short circuit**.
An unintended path in a circuit that allows current to flow with little or no resistance.
30
What is the effect of **increasing resistance** in a circuit?
It reduces the current flow according to Ohm's Law.
31
True or false: **Voltage** can exist without current.
TRUE
32
Fill in the blank: **Power** is measured in _______.
Watts
33
What is the purpose of a **resistor**?
To limit the flow of electric current in a circuit.
34
Define **inductor**.
A component that stores energy in a magnetic field when electric current flows through it.
35
What does a **wattmeter** measure?
A wattmeter measures the power in watts consumed by an electrical device.
36
True or false: **Electric fields** are created by electric charges.
TRUE
37
Fill in the blank: A **light bulb** converts electrical energy into _______ energy.
Light
38
What is the function of a **diode**?
To allow current to flow in one direction only.
39
Define **grounding**.
Connecting an electrical circuit to the earth to prevent electric shock.
40
What is **electrical safety**?
Practices to prevent electric shock and fire hazards in electrical systems.
41
True or false: **Circuit diagrams** use symbols to represent components.
TRUE
42
Fill in the blank: **Current** is measured in _______.
Amperes
43
What does **RMS** stand for in electrical terms?
Root Mean Square, a method to calculate effective voltage or current.
44
Define **frequency**.
The number of cycles per second in an alternating current, measured in hertz (Hz).
45
What is the role of a **transformer** in power distribution?
To step up or step down voltage for efficient transmission.
46
True or false: **Electric potential energy** is energy per unit charge.
TRUE
47
Fill in the blank: A **capacitor** stores _______ energy.
Electrical
48
What is the function of a **relay**?
To control a high-power circuit with a low-power signal.
49
Define **impedance**.
The total opposition to current flow in an AC circuit, combining resistance and reactance.
50
What does **reactance** refer to?
The opposition to alternating current caused by capacitors and inductors.
51
True or false: **Power factor** indicates how effectively electrical power is being converted into useful work.
TRUE
52
Fill in the blank: **Schematic diagrams** represent _______ connections in a circuit.
Electrical
53
What is the purpose of a **ground fault circuit interrupter (GFCI)**?
To prevent electric shock by disconnecting the circuit when a ground fault is detected.
54
Define **load** in electrical terms.
The component or device that consumes electrical power in a circuit.
55
What is **electrical efficiency**?
The ratio of useful power output to total power input, expressed as a percentage.
56
True or false: **Voltage drop** occurs across components in a circuit.
TRUE
57
Fill in the blank: **Electric shock** can occur when current passes through the _______ body.
Human
58
What is the purpose of a **surge protector**?
To protect electrical devices from voltage spikes.
59
Define **electrical circuit**.
A closed loop that allows electric current to flow from a power source.
60
What is the role of **semiconductors** in electronics?
To control the flow of current, acting as insulators or conductors depending on conditions.
61
True or false: **Batteries** store electrical energy chemically.
TRUE
62
Fill in the blank: **Voltage** is the potential difference between two _______.
Points
63
What is the function of a **voltage regulator**?
To maintain a constant voltage level in a circuit.
64
Define **electrical load**.
The total amount of power consumed by devices in a circuit.
65
What is the purpose of a **battery charger**?
To convert electrical energy from a source to recharge batteries.
66
True or false: **Current** can flow without a voltage source.
FALSE
67
Fill in the blank: **Electric fields** are measured in _______ per coulomb.
Volts
68
What is the role of **electrical insulation**?
To prevent unwanted current flow and protect users from electric shock.
69
Define **resistivity**.
A material's inherent property that quantifies its resistance to electric current.
70
What is the purpose of a **current transformer**?
To measure alternating current by producing a reduced current proportional to the input.
71
True or false: **Voltage** can be measured across a resistor.
TRUE
72
Fill in the blank: **Electric power** is the rate at which electrical energy is _______.
Consumed
73
What is the function of a **power supply**?
To provide electrical energy to a circuit or device.
74
Define **electromagnetic induction**.
The process of generating electric current by changing magnetic fields.
75
What is the purpose of a **battery management system**?
To monitor and control battery performance and safety.
76
True or false: **Electric circuits** can be open or closed.
TRUE
77
Fill in the blank: **Electric potential** is the potential energy per unit _______.
Charge
78
What is the role of **electrical connectors**?
To join electrical circuits or components together.
79
Define **grounding system**.
A safety system that connects electrical installations to the earth.
80
What is the purpose of a **safety switch**?
To disconnect power automatically in case of a fault.
81
True or false: **Electricity** is a form of energy.
TRUE
82
Fill in the blank: **Electric shock** can be fatal if the current exceeds _______ milliamperes.
100
Test
flashcards
Decks in class (19)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions