Current Electricity - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 1982

The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is

A. 985 ohms
B. 990 ohms
C. 995 ohms
D. 1000 ohms
E. 1005 ohms

Question 27:

• JAMB 1983

A milliameter with full scale deflection of 10mA has an internal resistance of 5 ohms. It would be converted to an ammeter with a full scale deflection of 1A by connecting a resistance of

A. \(\frac{5}{99}\)ohms in series with it
B. \(\frac{5}{99}\)ohms in parallel with it
C. \(\frac{99}{5}\)ohms in series with it
D. \(\frac{99}{5}\)ohms in parallel with it
E. 2 ohms in series with it

Question 28:

• JAMB 1983

A 24V potential difference is applied across a parallel combination of four 6-ohms resistor, The current in each resistor is

A. 1A
B. 4A
C. 16A
D. 18A
E. 36A

Question 29:

• JAMB 1983

The electrochemical equivalent of a metal is 0.126 x 10^-6 kgC^-1. The mass of the metal that a current of 5A will deposit from a suitable bath in 1 hour is

A. 0.0378 x 10 ^-3kg
B. 0.227 x 10 ^-3kg
C. 0.378 x 10 ^-3kg
D. 0.595 x 10 ^-3kg
E. 2.268 x 10 ^-3kg

Question 30:

• JAMB 1983

The difference of potential between the terminals of cells is 2.2 volts. When a 4ohm resistor is connected across the terminals of this cells, the potential difference is 2 volts. What is the internal resistance of the cell?

A. 0.10 ohms
B. 0.25ohms
C. 0.40ohms
D. 2.50ohms
E. 4.00ohms