An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?

By: |Published on: May 21|Categories: Physics WAEC| 0 comments

A. N7.20
B. N18.00
C. 180.00
D. N720.00

Correct Answer: Option A

A. N7.20

Explanation

Cost = (Pt/1000) x cost per kWh

= (40×72/1000)×2.50=N7.20

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