What is electricity? Unit Review

Label the picture of an atom.

a

b

c

Electron

Proton

Neutron

Listen and fill in the gaps.

Electricity consists of a ​ (a)   of free electrons along a conductor. To produce this current flow, a generator is placed at the end of the conductor to move the ​ (b)   .

Electricity needs a material that allows a current to pass through easily, which offers little ​ (c)   to the flow and is full of free electrons.

Small quantities of these substances are introduced in the material to ​ (d)   the conductivity. ​

Glass, rubber, dry wood and ​ (e)   resist the flow of electric charge, and as such they are good insulating materials.

• flow
• charge
• resistance
• reduce
• plastic

Use the information from the listening text and decide if the following statements are true or false.

A generator is used to move the charges.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

A flow of electrons moving inside a conductor creates an electric current.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

Electrons can easily pass through any material.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

Any material is a good conductor.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

Impurities are introduced to increase conductivity.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

Insulating materials resist the flow of electrons.

• True

• False

Use the information from the listening text and decide if the following statements are true or false.

Conductors are coated with insulators.

• True

• False

Read the text and then match the following units of measurement and what it measures.

• the quantity of electricity transferred by a steady current of one ampere

• Watts (W)

• the amount of electric energy used

• Kilowatt (kW)

• rate at which work is done

• Amperes (A)

• the number of electrons passing a given point in a conductor in one second

• Volts (V)

• the difference of potential between two points on a conductor

• Coulomb (C)