Grade 10 Physics: Electricity (Mr. Emmanuel)

Ohm's law ststes that the ratio V/I is constant for

i. steel

ii. An electrolyte

iii. silver

iv. diode

Which of th above are correct?

• i and ii only

• i and iii only

• iii and iv only

• i, ii, iii, iv

The quantity of electricity is measured in the unit of

• Ampere

• the volt

• the coulomb

• the electromotive force

The energy needed to move a unit positive charge around a complete electric circuit is called the

• electromotive force

• electric potential difference

• electrical energy

• kinetic energy

A current of 180 mA passes through a conductor for 5 minutes

• 54 C

• 0.9C

• 0.036 C

• 0.0009 C

60 mC of electricity passes through a conductor for 2 minutes. The current through the conductor is

• 7.2 A

• 120 mA

• 30 mA

• 0.5 mA

Wire X has twice the diameter and twice the length of wire Y made of thesame material. The ratio of the ressistance of X to Y is

• 1:4

• 4:1

• 1:2

• 1:1

Which of the given is the SI Unit of Electric Current?

• Ohm

• Ampere

• Volt

• Faraday

The hindrance presented by material of conductor to the smooth passing of electric current is known as:

• Resistance

• Conductance

• inductance

• capacitance

The rate of flow of an electric charge is known as

• electric potential

• conductance

• current

• pd

The instrument used for measuring electric current is

• Ammeter

• Voltmeter

• Potentiometer

• rheostart