One of the main topics covered in GCSE Physics is electricity. In this quiz we look in particular at current, voltage and resistance in electrical circuits.

Circuits are electrical systems that provide a path for current to flow. If a circuit is broken, for example by using a switch, current is no longer able to move through it. If there is a short circuit, an electrical system will not work properly. A short circuit is a fault in a system that links two parts of a circuit that should not be linked together. In other words, it is a pathway that takes the electricity in the wrong direction.

Electrical circuits can have a wide range of applications; controlling your central heating; playing a door chime when the bell is pressed; inside computers and smartphones; controlling a car engine, and many, many more. They all follow the same straightforward laws, and it is how the components are arranged together that can make them do some pretty complicated things.

1 .

If two resistors are connected in parallel in a circuit, which has a total electrical potential difference of five volts, what is the value of the electrical potential difference across each resistor?

2.5 V

1.25 V

5 V

10 V

When two components are connected in parallel, they are connected to the same points of the circuit, so the electrical potential difference across each one is the same

2 .

If two five ohm resistors are connected in series, what is the total resistance of the circuit?

5 ohms

10 ohms

2.5 ohms

7.5 ohms

Resistance of resistors in series are easy - just add up the individual values to get the total resistance

3 .

What can be found by measuring current and voltage?

Resistivity

Resistance

The direction of true north

Magnetic field strength

Measuring current and voltage lead German scientist Georg Simon Ohm to the conclusion that is now known as **Ohm's law**

4 .

What is the unit of resistance?

Ohm

Volt

Ampere

Coulomb

Ensure you always put units on the end of any question which asks for a numerical answer. The units of resistance are named after Ohm

5 .

If a 100 ohm resistor is replaced with a 200 ohm resistor, whilst the potential difference is kept constant, what happens to the current?

Stays the same

Increases

Decreases

There is not enough information

Current is inversely proportional to resistance - as resistance is doubled the current is halved

6 .

Which equation correctly relates voltage, resistance and current?

This is how you write down Ohm's law mathematically

7 .

An LED emits light when the current flows through it in which direction?

Forwards

Backwards

No current flow

Up and down

LED is the abbreviation for light emitting **diode** so from that, you should know that electrical charge can only flow through in the forwards direction through a diode

8 .

If three 1.5V cells are connected in series, what is the total potential difference provided by the cells?

3 V

4.5 V

5.5 V

1.5 V

In series, just like with resistors, the voltages of the cells are added together

9 .

The current through a component depends on which of the following?

The resistance of the component

The size of the component

The material of the component

The colour of the component

A bigger resistance means a smaller current. This is not the only factor affecting the current

10 .

How is the current of a resistor related to the potential difference across it?

Inversely proportional

Directly proportional

Equal

One-fifth of the potential difference

If the potential difference across a one ohm resistor is increased by one volt, the current will also increase by one amp

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