Revision Quiz Grade 8

The nucleus contains two types of particles: protons and ____________________.

• electrons

• neutrons

• atomic mass

• atomic number

Plastic is often used to coat wires because electric charges cannot move through the plastic easily.

• True

• False

______________________ is the amount of work required to move each unit of charge between two points.

• Resistance

• Voltage

• Circuit

• Load

_________________________________ are a special class of materials that conduct electric charge better than electrical insulators but not as well as electrical conductors.

• Semiconductor

• Semiinsulator

Three ways that objects can gain or lose electrons are by ____________________, _______________________ or __________________________.

• fiction, charging, rubbing

• friction, induction , contact

• adding water, rubbing, contact

Positively charged ions have more protons than electrons.

• True

• False

•The rate of flow of electric charges is called ______________________

• static electricity

• electric current

In ____________________________, charges repeatedly shift from flowing in one direction to flowing in the reverse direction.

• alternating current

• direct current

Voltage is expressed in units of __________________.

• Ampere (amp)

• volts (V)

All atoms have a dense center called a nucleus.

• True

• False