safety in the workshop and factors of electricity

What is the symbol used to represent the unit of electric current?

• R

• I

• A

• C

Which of the following fire extinguisher can be best used on an electrical fire.

• water

• carbon dioxide

• foam

• dry powder

The factors that can affect the resistance of a material are:

• length,thickness,size, colour

• length, cross-sectional area ,insulation,type of material

• width,type of material, cross-sectional area, insulation

• temperature,length,type of material,cross-sectional area

Which of the following is the unit for potential difference?

• volt

• ohm

• ampere

• coulomb

A physical sensation caused by an electric current reacting with the nerves is called an:

• impulse

• electric burn

• electric shock

• electrocution

The unit of resistance is:

• ohms

• amperes

• watts

• volts

Before attempting to repair an electrical circuit,ensure that:

• you have the correct tool

• the power supply is ON

• the circuit is completed

• the power supply is OFF

The force that causes electrons to move through a circuit is called:

• resistance

• voltage

• current

• power

Electric current is measured in:

• ohms

• coulombs

• amperes

• volts

A current which flows in one direction and then changes a flows in an opposite direction is called a/an:

• indirect

• changing

• direct

• alternating