Electrical Systems

_____ is the rate of flow of electric charges.

• Current

• Potential difference

• Power

• Energy

The symbol shows a _____.

• switch

• bulb

• rheostat

• battery

There are _____ batteries in the diagram,

with the positive terminal on the _____.

• 4, left

• 4, right

• 2, left

• 2, right

Ammeters must be connected in _____ to measure current.

• parallel

• series

Voltmeters must be connected in parallel to measure _____.

• potential difference

• current

• energy

• power

The _____ makes use of the magnetic effect of current.

• earpiece

• electroplating method

• kettle

• filament bulb

Power is the amount of _____ converted in one second.

• energy

• current

• potential difference

The S.I. unit for potential difference is _____.

• ampere

• joule

• watt

• volt

Ampere is the S.I. unit for _____.

• current

• potential difference

• power

• energy

A 2 kW freezer is used for 3 hours. The energy used is _____ kWh.

• 1.5

• 2

• 6

• 12