Commercial unit of electric energy and power - Jamb Physics Past Questions and Answers

Question 6:

• 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 7:

• JAMB 2020

Which of the following instruments consumes the highest current?

I. Electric iron	250v	1kW
II. Television set	220v	110W
III. Torch light	6v	30W
IV. Immersion heater	110v	500W

A. I
B. II
C. III
D. IV