Electricity

Question 1

What is the unit of electric current?

Answer 1

Ampere (A)

Question 2

True or False: Voltage is the measure of the energy per unit charge.

Answer 2

True

Question 3

Fill in the blank: The formula for calculating resistance is ____ = Voltage / Current.

Answer 3

Resistance

Question 4

What is the unit of resistance?

Answer 4

Ohm (Ω)

Question 5

What is the relationship between voltage, current, and resistance called?

Answer 5

Ohm’s Law

Question 6

Multiple Choice: Which of the following is a conductor? A) Rubber B) Copper C) Wood

Answer 6

B) Copper

Question 7

What is the main function of a fuse in an electrical circuit?

Answer 7

To protect the circuit from overcurrent.

Question 8

True or False: AC stands for Alternating Current.

Answer 8

True

Question 9

What does DC stand for?

Answer 9

Direct Current

Question 10

Fill in the blank: The total current entering a junction equals the total current ____ it.

Answer 10

leaving

Question 11

What is the formula for electrical power?

Answer 11

Power (P) = Voltage (V) x Current (I)

Question 12

Multiple Choice: What is the unit of power? A) Joule B) Watt C) Volt

Answer 12

B) Watt

Question 13

What is the purpose of a circuit breaker?

Answer 13

To stop the flow of electricity in case of a fault.

Question 14

True or False: Insulators allow electric current to flow freely.

Answer 14

False

Question 15

Fill in the blank: In series circuits, the total resistance is equal to the ____ of individual resistances.

Answer 15

sum

Question 16

What is the effect of increasing resistance in a circuit with constant voltage?

Answer 16

The current decreases.

Question 17

Multiple Choice: Which component stores electrical energy? A) Resistor B) Capacitor C) Diode

Answer 17

B) Capacitor

Question 18

What is the main difference between series and parallel circuits?

Answer 18

In series, components are connected end-to-end; in parallel, components are connected across the same voltage source.

Question 19

True or False: The voltage across each component in a parallel circuit is the same.

Answer 19

True

Question 20

What happens to the total current in a parallel circuit as more branches are added?

Answer 20

The total current increases.

Question 21

Fill in the blank: The energy transferred by an electric charge is called ____ energy.

Answer 21

electrical

Question 22

What is the function of a light-emitting diode (LED)?

Answer 22

To emit light when current flows through it.

Question 23

Multiple Choice: What type of circuit is used to connect multiple devices to a single power source? A) Series B) Parallel C) Both

Answer 23

B) Parallel

Question 24

True or False: The total voltage in a series circuit is the sum of the voltages across each component.

Answer 24

True

Question 25

What is the role of a resistor in a circuit?

Answer 25

To limit the flow of electric current.

Question 26

Fill in the blank: The measure of how much energy is used by a device in one second is called ____.

Answer 26

power

Question 27

Define charge

Answer 27

Value for electricity flowing in a circuit

Question 28

Define current

Answer 28

Flow of electrons

Question 29

What does potential difference do to a current?

Answer 29

Pushes around the current

Question 30

What does Resistance do?

Answer 30

Slows down current

Question 31

Equation for charge

Answer 31

Q = I x T Charge (Coulombs) = Current (Amps) x Time (seconds)

Question 32

Equation for potential difference

Answer 32

V = I x R Potential difference (Volts) = Current (Amps) x Resistance (Ohms)

Question 33

How does current move in a series circuit?

Answer 33

Always along the same path / same way

Question 34

How does current move along a parallel circuit?

Answer 34

Total current is split across branches

Question 35

In which circuit is the total potential difference split across components

Answer 35

Series circuit

Question 36

How to work out total resistance in a series circuit

Answer 36

Total resistance = Resistances added together

Question 37

How to workout total resistance in a parallel circuit

Answer 37

Total resistance = 1/R1 + 1/R2

Question 38

What is the mains electricity in the UK?

Answer 38

230 V 50 Herts

Question 39

Equation for energy

Answer 39

E = P x t Energy (J) = Power(W) x time(s) OR Energy(J) = charge(coulombs) x potential difference(V)

Question 40

How to get electricity from power stations to house

Answer 40

The national grid Power stations generate electricity and move it to a step up transformer which goes through a network of wires across the country to step down transformer into our house

Question 41

Which transformer takes electricity from a high voltage to low voltage?

Answer 41

Step down transformer

Question 42

What is static electricity

Answer 42

A object that isn’t normally charged becoming charged

Question 43

How can static electricity happen?

Answer 43

2 insulators rubbing together - 2 charged objects repel Movement of electrons from one thing to another thing If you touch something metal the charge will reset and you can get a shock

Question 44

What 2 factors does the current in a circuit depend on?

Answer 44

Potential difference Resistance

Question 45

Explain current flow in a resistor

Answer 45

Directly proportional

Question 46

Explain current flow in a filament bulb

Answer 46

As temperature increases, potential difference increases

Question 47

Describe current flow in a diode

Answer 47

Only flows in one direction

Question 48

Describe current flow in a thermistor

Answer 48

As temperature changes, resistance changes

Question 49

Describe current flow in a Light Dependent Resistor

Answer 49

Resistance flowing through circuit changes with amount of light

Question 50

State 2 equations for power of a circuit

Answer 50

Power = Current x Potential difference (volts) Power ( watts) = Current (amperes) squared x Resistance (ohms)