Circuits (P4)

• Physics
• Upper Secondary (Key Stage 4)
• GCSE

Circuits (P4)

You will need a pen, some paper and a calculator.

Conventional current flows from

1. Positive to negative
2. Negative to positive

Electrons flow from

1. Positive to negative
2. Negative to positive

Drag the symbol to its name:

ammeter

voltmeter

fuse

filament bulb

diode

thermistor

switch

variable resistor

cell

light dependent resistor

Drag the unit to the physical quantity:

charge

time

potential difference

current

resistance

energy

power

C

J

V

Ω

s

A

W

They may need a few minutes to read and digest this!

Describe the relationship between current and potential difference for a fixed resistor.

no correct answer specified - I like to flip their answers on the board and discuss their answers - what's missing etc

Describe the relationship between current and potential difference for a diode.

Describe the relationship between current and potential difference for a filament lamp.

For a fixed resistor, the smaller the gradient on the I-V graph, the...

1. lower the resistance
2. higher the resistance
3. lower the current
4. higher the current

A non-linear conductor is...

1. a component whose resistance is not constant
2. a non-ohmic conductor
3. a resistor
4. a lamp

3 possible correct answers but students only pick one

For an ohmic conductor, potential difference and current are directly proportional when

1. temperature increases
2. temperature decreases
3. temperature is constant
4. temperature does not matter

As temperature increases, the resistance of a thermistor...

1. increases
2. decreases
3. stays the same

As it gets brighter, the resistance of an LDR...

1. increases
2. decreases
3. stays the same

Calculate the charge flow when a current of 0.6 A passes through a bulb in 1 minute. Give your answer in Coulombs (C).

Just the numerical answer needed - it will mark it wrong if they give units

There is a current of 0.3 A in a circuit. How long will it take for 36 C to flow past a point in the circuit? Give your answer in seconds (s).

The energy transferred to a bulb is 320 J when 64 C of charge passes through it. Calculate the potential difference across the bulb. Give your answer in volts (V).

Calculate the current in a circuit when there is a potential difference of 230 V and a resistance of 55 Ω. Give your answer in amps (A) to 2 significant figures.

Calculate the resistance of a circuit when there is a potential difference of 1.5 kV and a current of 30 mA. Give your answer in ohms (Ω).

Explain why resistance increases with increasing length.

How much energy is used when a 1400 W hairdryer is used for 2 minutes? Give your answer in joules (J).

Calculate the energy transferred after 5 minutes when 1.5 A of current flows through a component which has a p.d. of 6 V. Give your answer in joules (J).

Calculate the current through R1.
Give your answer in amps (A).

Calculate the current through R2.
Give your answer in amps (A).

Calculate the current through R3.
Give your answer in amps (A).

What is the current through the battery?

1. 6 A
2. 9 A
3. 10 A
4. 12 A

What is V1?
Give your answer in volts (V)

What is A1?
Give your answer in amps (A)

What is A2?
Give your answer in amps (A)

What is A3?
Give your answer in amps (A)

Adding more resistors in parallel causes the overall resistance of a circuit to...

1. increase
2. decrease
3. stay the same

Explain why adding more resistors in parallel causes the overall resistance of a circuit to decrease.

In a series circuit...

1. current is shared between components
2. current is the same in each component
3. p.d. is shared between components
4. p.d. is the same across each component

In a parallel circuit...

1. current is shared between branches
2. p.d. is shared between branches
3. p.d. is the same across each branch
4. current is the same across each branch