S4_Term 1_Reviewer

The circuit shows a 2.0ohm resistor and a 1.0ohm resistor connected to a 12V battery. What is the current in your circuit?

• 4.0 A

• 6.0 A

• 24 A

• 36 A

The diagram shows an electric circuit. What is the potential difference (p.d.) across the LDR?

• 4.0 V

• 8.0 V

• 25 V

• 50 V

The diagrams each show a positive point charge. Which diagram represents the pattern and the direction of the electric field due to the charge?

• A

• B

• C

• D

A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots a graph of her results. Which circuit should she use?

• A

• B

• C

• D

A student connects a circuit with a power supply, a lamp and an ammeter. Where must the ammeter be connected?

• in parallel with the lamp to measure current in the lamp

• in parallel with the lamp to measure potential difference across the lamp

• in series with the lamp to measure current in the lamp

• in series with the lamp to measure potential difference across the lamp

There is a current in a metal wire. Which particles in the wire move to cause this current?

• alpha-particles

• electrons

• neutrons

• protons

What is the unit of charge?

• ampere

• coulomb

• ohm

• volt

The resistance of a component in a circuit is found using an ammeter and a voltmeter. How are the ammeter and the voltmeter connected?

• the voltmeter and ammeter in parallel with the component

• the voltmeter and ammeter in series with the component

• the voltmeter in parallel with the component and the ammeter in series with the component

• the voltmeter in series with the component and the ammeter in parallel with the component

Two lamps are connected in parallel. Which switches must be closed so that both lamps light?

• S₁ and S₂ only

• S₁ and S₃ only

• S₂ and S₃ only

• S₁ , S₂ and S₃ only

A thermistor is used in a circuit to control piece of equipment automatically. What might this circuit be used for?

• lighting an electric lamp as it becomes darker

• ringing an alarm if a locked door is opened

• switching on a water heater at a pre-determined time

• turning on an air conditioner when the temperature rises