Electrical Energy and Power - Jamb Physics Past Questions and Answers

Question 46:

• JAMB 2010

Power supply is transmitted at a very high voltage and low current in order to

A. Make pass through the trasformers
B. Increase the power supply
C. Make it travel fast
D. Prevent overheating of the coil

Question 47:

• JAMB 2010

In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kwh is sold at N40, the cost of keeping the bulb lighted for a day is

A. N1,920.00
B. N192.00
C. N19.20
D. N1.92

Question 48:

• JAMB 2011

If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?

A. N28
B. N12
C. N16
D. N24

Question 49:

• JAMB 2011

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

A. Parallel connections do not heat up the wires
B. Series connections use high voltage
C. Less current will be used
D. Less voltage will be used

Question 50:

• JAMB 2012

A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

A. 2A
B. 5A
C. 10A
D. 20A