Basic Electrics.

A colleague suffers an electric shock when using an electric drill. Your first action is:

• Pull the drill away from them.

• Ring the emergency services.

• Switch off the power supply.

• Inform your supervisor.

The unit of electrical power is the:

• Coulomb

• Amp

• Watt

• Volt

What is the maximum reading the meter can display with the switch in the selected position?

• 20 volts DC

• 12 volts DC

• 20 volts AC

• 10 amps

An LED is a type of:

• Electronic sensor.

• Diode that emits light.

• Transistor that emits light.

• Diode used in rectifiers.

Current flow in a circuit is measured using:

• A volt meter.

• An ammeter.

• An ohm meter.

• A dwell meter.

A relay is normally fitted to a vehicle's headlamp circuit to:

• Control operation of dip/main beam h/lamps.

• Reduce resistance of h/lamp lighting circuit.

• Reduce current flow through lighting switch.

• Increase current flow through lighting switch.

A lamp with a poor earth connection will cause:

• The circuit fuse to blow.

• The lamp to be brighter.

• The bulb to blow.

• The lamp to be dim.

If R1 fails in this lighting circuit what will happen to R2 and R3?

• They will both stay lit.

• Only R2 will stay lit.

• Only R3 will stay lit.

• Both will go out.

A voltmeter should be connected:

• In parallel with components.

• Only when the battery is disconnected from the vehicle.

• Only when the ignition is switched off.

• In series with components.

What will happen in the circuit when the switch is closed?

• The bulbs will glow dimly.

• The bulbs will illuminate but the battery will go flat.

• Only one bulb will illuminate.

• The fuse will blow.