Test 1: Electric Current, EMF and Potential Difference

Question 1

Electricity is a branch of physics which deals with the:

• Aflow of charges
• Bstudy of light
• Cstudy of heat only
• Dstudy of sound

Question 2

Amount of charge passing through any cross section of a conductor per unit time is called:

• Aelectric current
• Bpotential difference
• Cresistance
• Dpower

Question 3

If Q charge flows in time t, the current I is given by:

• AI = Q x t
• BI = t/Q
• CI = Q/t
• DI = Q + t

Question 4

The SI unit of electric current is the ampere, where 1 A equals:

• A1 J C^-1
• B1 C s^-1
• C1 V A^-1
• D1 W s^-1

Question 5

In metals, some electrons can move freely because they are:

• Anot tightly bonded with the nucleus
• Binside the nucleus
• Cprotons
• Dpositively charged