Current Electricity - Jamb Physics Past Questions and Answers

Question 41:

• JAMB 1985

An electric kettle, connected to a 240V mains, produces 6.0 x 10⁵J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.

A. 14.4\(\Omega\)
B. 28.8\(\Omega\)
C. 144\(\Omega\)
D. 288\(\Omega\)
E. 2880\(\Omega\)

Question 42:

• JAMB 1986

Which of the following properties makes metals ideal for cooking utensils?

A. High coefficient of expansion
B. Good conduction of heat
C. Low specific heat capacity
D. Poor radiation of heat

Question 43:

• JAMB 1986

In fig 9 the value of R is

A. 3Ω
B. 4Ω
C. 5Ω
D. 6Ω

Question 44:

• JAMB 1986

if the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is

A. 0.3A
B. 0.8A
C. 1.0A
D. 1.8A

Question 45:

• JAMB 1987

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A. 1200J
B. 1500J
C. 2400J
D. 96000J