Electrical Energy And Power - Physics Jamb Past Questions and Answers

Question 61 :

• JAMB 2018

The efficiency of energy conversion on the energy flow through a hydroelectric power is?

A. \(\frac{E1}{E2}\)
B. \(\frac{E3}{E2}\)
C. \(\frac{E2}{E1}\)+ E2
D. \(\frac{E2}{E3}\) + E1

Question 62 :

• JAMB 2018

Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to

A. Heat dissipation
B. Production of eddy currents
C. Excessive current discharge
D. Excessive voltage discharge

Question 63 :

• JAMB 2019

Ripple in a power supply unit is caused by

A. Using an alternating current source
B. Forward voltage drop
C. Heavy load
D. Using a zener diode

Question 64 :

• JAMB 2020

Which of the following can be described as high tension transmission?

A. High resistance and low voltage
B. Low current and high voltage
C. High current and low voltage
D. High current and low resistance

Question 65 :

• JAMB 2020

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. N0.39
C. N3.90
D. N0.13