Processing math: 100%

Home / Aptitude Tests / Physics / What is the cost of ...

What is the cost of running five 50W lamps and four 100W lam...

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?

A.

N0.65

B.

N0.13

C.

N3.90

D.

N39.00

E.

N234.00

View answer & explanation

Correct answer is B

P_T = (5 x 50) + (100 x 4)

= 650watts

Energy(kWhr) = 650 x 10^-3 x 10

= 6.5 kWhr

1kWhr cost 2 kobo ; 6.5 kWhr will cost $\frac{2 \times 6.5}{1}$

= 13 kobo

See all Physics questions & answers

See more JAMB questions & answers

Similar Questions

Electric energy is measured in ...

One newton × One meter equals? ...

The speed of light in vacuum is 3.0 x 108ms-1. If the refractive index of a transparent liquid is \(...

When a red rose flower is observed in blue light, what colour does the observer see? ...

Which of the following devices does not makes use of eddy current for its action? A/An ...

An object at rest is said to possess ...

caesium has a work function of 3 x 10-19J. the maximum energy of liberated electrons when it is illu...

Eight or - particles and size B - particles are emitted from an atom of 92238U before it achieves st...

If the temperature of a resistance wire is gradually increased, its resistance will ...

The diagram above show s the force-extension curve of a piece of wire. The energy stored when the wi...

Aptitude Tests

Puzzles Questions and Answers

Logical Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Situational Judgement Questions and Answers

Personality Test

Typing Speed and Accuracy Test

Microsoft Office Questions and Answers

Numerical Reasoning Questions and Answers

Spatial Reasoning Questions and Answers

Nigeria General Knowledge Questions and Answers

Abstract Reasoning Questions and Answers

Data Interpretation Questions and Answers

Verbal Reasoning Questions and Answers

View latest jobs in Nigeria today