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### Exercise condition:

9
1. Define an electric current.

a. The rate of flow of  is called electric current.

b. The unit of electric current is  of the two surfaces produces frictional force.

c. Electric current is measured by the symbol .

2. Differentiate parallel and serial circuits.

a. Parallel circuits has .

b. The  remains constant throughout the circuit.

c. If one bulb fails, others remain .

3. Define electrical conductivity.

a. Electrical conductivity is also known as .

b. The ability of a material to conduct an electric current is measured by .

c. The unit of electrical conductivity is .