Try this as often as you like.

You will get a different set of questions each time you attempt this quiz.

You will get a different set of questions each time you attempt this quiz.

- Which one of the following materials is the best insulator?
- Rubber
- Iron
- Brass
- Copper

- The pull on the electrons by a battery in an electric circuit is more commonly called the
- electromotive force of the battery
- voltage of the battery
- potential difference of the battery
- energy of the battery

- What energy change takes place when a battery is connected to a light bulb?
- Chemical → electrical → light
- Chemical → light → electrical
- Light → electrical → chemical
- Heat → electrical → light

- Which is the correct symbol for potential difference?
- V
- A
- P
- W

- Which one of the following is the unit of resistance?
- Ohm
- Volt
- Amp
- Joule

- Which one of the following statements is CORRECT?
- Current is measured in amps and has the symbol I
- Voltage is measured in amps and has the symbol I
- Current is measured in amps and has the symbol C
- Resistance is measured in volts and has the symbol R

- Which one of the following graphs shows the relationship between the potential difference (voltage) and current for a resistor in a circuit at a constant temperature?
- Name the measuring instruments X and Y in the circuit shown.
- X = ammeter, Y = voltmeter
- X = multimeter, Y = ohmmeter
- X = voltmeter, Y = ammeter
- X = voltmeter, Y = ohmmeter

- Which one of the following formulae describes the relationship between the potential difference (V) and the current (I) for a resistance (R)
- V = IR
- R = V÷I
- V = I÷R
- I = RV

- The potential difference across a resistance of 2 ohms in a circuit is 12 volts. What is the value of the current passing through the resistance?
- 6 amps
- 24 amps
- 1/6 amp
- 14 amps

- What is the resistance of a piece of wire when the current flowing through it is 0.12 amps and the potential difference across is 12 volts?
- 100 ohms
- 1.44 ohms
- 12.12 ohms
- 0.01 ohms

- What is the potential difference across a 50 ohm resistor when the current passing through it is 0.1 amps?
- 5 volts
- 50.1 volts
- 0.02 volts
- 50 volts

- A 60 ohm resistance is placed across a 12 volt battery. If an ammeter is placed in the circuit as shown, what current will it read?
- 0.2 amps
- 2 amps
- 48 amps
- 5 amps

- The unit of current, potential difference and resistance respectively are:
- amps, volts and ohms
- volts, amps and ohms
- joules, volts and amps
- amps joules and ohms

- Name the devices labelled A, B and C in the diagram shown
- A = bulb, B = resistor and C = battery
- A = battery, B = resistor and C = bulb
- A = bulb, B = battery and C = switch
- A = resistance, B = switch and C = battery

- The flow of electric charge in one direction only in a circuit is known as:
- direct current
- alternating current
- potential difference
- resistance

- The volt is the unit of
- potential difference
- electric current
- temperature
- resistance

- Which one of the following energy changes occurs in a resistor?
- Electric energy changed to heat energy
- Electric energy changed to light energy
- Heat energy changed to electric energy
- Heat energy changed to light energy

- Using the triangle shown, what is the expression used for calculating the current flowing in a circuit?
- I = V/R
- I = VR
- V = IR
- R = V/I

- Which one of the following symbols is that for the variable resistor?
- The graph shown is that for voltage against current for a length of resistance wire.

What is the resistance of the wire?- 10 ohms
- 0.2 ohms
- 0.8 ohms
- 45 ohms

- The relationship between potential difference (V), current (I) and resistance (R) for an electrical circuit is known as
- Ohm's Law
- Murphy's Law
- Einstein's Law
- Boyle's Law

- Electricity is caused by a flow of protons.
- FALSE
- TRUE

- Copper is a good conductor of electricity
- TRUE
- FALSE

- Which one of the following statements is incorrect?
- Plastic is a good conductor.
- An insulator does not allow charges to pass through it.
- Electrons are not free to move from atom to atom in insulators.
- A conductor allows electric charge to pass through it.

- Which one of the following statements is incorrect?
- When a switch is closed in a circuit, no current flows.
- An electric circuit is a complete loop around which a current can flow.
- A switch is a device for turning on and off an electric current.
- An electric current is a flow of charge.

- Which one of the following does
**not**give us an electric current?- A bulb
- A power supply
- An AA battery
- The mains supply

- The potential difference of a battery is often called
- voltage
- current
- resistance
- conductance

- Which of these voltages would be the most dangerous?
- 230 V mains voltage
- 1.5 V AAA battery
- 10,000 V Spark from a car door handle
- 10,000 V electric fence

- The positive and negative terminals of a power supply are colour coded.

What are these colours?- Red = Positive and Black = Negative
- Yellow = Positive and Black = Negative
- Black = Positive and Red = Negative
- Red = Positive and Yellow = Negative

- Which one of the following is a conductor?
- Pencil lead
- Paper
- Plastic
- Glass

- Which one of these statements is incorrect?
- The symbol for potential difference (voltage) is P.
- Voltage is measured in volts.
- Potential difference is measured with a voltmeter.
- An AAA battery may be tested with a multuimeter.

- Which one of these statements is NOT correct?
- Electric current is measured with a voltmeter.
- The unit of current is the amp (A)
- A multimeter can also measure current.
- Resistance is measured in ohms.

- The ability of a body to oppose a flow of charge through it, is known as
- its resistance
- its solubility
- its potential difference
- its conductance

- Which one of these statements is NOT correct?
- Copper has a very high resistance
- The unit of the resistance is the ohm.
- Resistance may be measured using a multimeter.
- An ohmmeter is used to measure resistance.

- Which one of the following has the highest resistance
- A plastic ruler
- Lead in a pencil
- Metal ruler
- Nichrome wire

- Current is passed through a resistor, and the voltage across the resistor measured using a multimeter.

What will happen to the voltage if the current is doubled?- The voltage doubles.
- The voltage is halved.
- There is no change in the voltage.
- The voltage starts increasing steadily until it goes off the scale of the multimeter.

- Current is passed through a variable resistor, and the current is measured using an ammeter. The voltage is kept constant.

What will happen to the current if the resistance is doubled?- The current is halved.
- The current is doubled.
- There is no change in the current.
- The current reduces to zero.

- Which one of the following equations represents Ohm's Law?
- V = I × R
- R = V × I
- V = I ÷ R
- I = R × V