Revision: Sources of electricity

Revision: Sources of electricity

Content

1) electricity is generated at power stations

2) batteries are portable source of energy

Multiple Choice

________________ such as oil, goal and natural gas need to burn to make electricity.

• fossil fuels

• movement

Multiple Choice

A step-down transformer changes ......................... voltage into a ........................ voltage. A step-up transformer does the .......................

• lower, higher, opposite

• lower, higher, same

• higher, lower, opposite

• higher, lower, same

Multiple Choice

Dry cells store energy in the form of ....................

• chemical potential energy

• electrical energy

• kinetic energy

• magnetic energy

Multiple Choice

What is the name of the coil that produces the output voltage?

• iron core

• primary coil

• secondary coil

• transformer

Multiple Choice

What is the name of the missing component in the figure below?

• iron core

• primary coil

• secondary coil

• turbine

Multiple Choice

Which of the following is not a type of power station?

• coal-fired power station

• charcoal-fired power station

• gas-fired power station

• oil-fired power station

Multiple Choice

Why is electricity transmitted in high voltages?

• less dangerous to humans.

• less prone to fire in transmission cables.

• to power more appliances.

• to reduce energy loss.

Multiple Choice

Compared to batteries, the mains electrical supply is .....................

• not portable and higher in voltage.

• not portable and lower in voltage.

• portable and higher in voltage.

• portable and lower in voltage.

Multiple Choice

The core of a transformer is made of ........................

• aluminium.

• copper.

• iron.

• silver

Multiple Choice

A transformer only works with ...................

• a direct current.

• a direct voltage.

• an alternating current.

• an alternating voltage