Electricity GCSE - Circuits

What is the best definition for current.

• the flow of charge.

• how much charge flows past a point in a unit of time.

• how much charge there is around the circuit.

• the energy used by charge as it flows.

A current of 1.5 A flows for a time and a total of 15 C of charge flows past each point in a circuit. How long does the current flow?

• 22.5 s

• 10 s

• 0.1 s

• 16.5 s

How should an ammeter be connected to measure the current through a bulb?

• In series with the bulb.

• In parallel with the bulb.

• It doesn't matter, you'll always get the same reading.

potential difference (Voltage) can be calculate from...

• Voltage = Energy x Charge

• Voltage = Energy x Current

• Voltage = Energy / Charge

• Voltage = Energy / Current

What is the voltage across a light bulb if it uses 100 J of energy per second and 0.5 coulombs of charge per second.

(a)  

What is the relationship between potential difference, current and resistance across a component.

• V = I/R

• I = V x R

• V = R/I

• V = I x R

What is the resistance of the R₂ resistor if the current is 0.8 A in ohms? (value only needed, no units.

(a)  

What is the value of the voltage (V1)? (value only needed, no units.

(a)  

Which type of circuit is better in a situation where you need to control several lights individually with different switches, but they all run off the same power supply?

• Series

• Parallel

• Either.

• Neither.

What is the unknown current at this wire junction? value and units.

(a)