Sources of Electricity

In a fossil fuel power station, what is the overall energy conversion?

What is the energy conversion that takes place in the generator at the power station?

Identify the various parts of the transformer.

• X: iron core

  Y: primary coil

  Z: secondary coil

• X: primary coil

  Y: secondary coil

  Z: iron core

• X: secondary coil

  Y: iron core

  Z: primary coil

• X: primary coil

  Y: iron core

  Z: secondary coil

Fill in the blank:

A transformer changes (a)   .

Fill in the blank:

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

Which statement is true?

• Transformers work only with alternating current.

• Transformer work only with direct current.

• Transformers can work with both alternating and direct current.

• Transformers convert alternating current into direct current.

Why is electricity transmitted in high voltages?

• to reduce energy loss

• to power more appliances

• less dangerous to humans

• less prone to fire in transmission cables

Which form of energy is stored in dry cells?

• chemical energy

• electrical energy

• kinetic energy

• magnetic energy