Electrical Energy and Power - Jamb Physics Past Questions and Answers

Question 56:

• JAMB 2014

PHCN measures its electrical energy in

A. W
B. KWh
C. Wh
D. J

Question 57:

• JAMB 2017

What is the cost of running seven 40 W lamps and five 80 W la mps for 12 hours of the electrical energy cost N7.00kWk?

A. N80.00
B. N45.36
C. N65.00
D. N57.12

Question 58:

• JAMB 2018

Electrical appliances in homes are normally earthed so that

A. A person touching the appliances is safe from electric shock
B. Both the a.c. and d.c. sources can be used
C. The appliances are maintained at a higher pd than the earth
D. The appliances are maintained at a lower pd than the earth

Question 59:

• JAMB 2018

In homes, electrical appliances and lamps are connected in parallel because

A. Less current will be used
B. Less voltage will be used
C. Parallel connection does not heat up the wires
D. Series connection uses high voltage

Question 60:

• JAMB 2018

Which of the following is an essential physical property of the wires uses for making fuses ?

A. Low density
B. Hypothermal conductivity
C. Low electrical resistivity
D. Low melting point