Current Electricity - Jamb Physics Past Questions and Answers

Question 121:

• JAMB 2014

If a metal wire 4m long and cross-sectional area 0.8 mm² has a resistance of 60, find the resistivity of the wire

A. 5.3x10^-7
B. 3.0x10^-5
C. 1.2x10^-6
D. 3.2x10^-6

Question 122:

• JAMB 2014

A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when

A. A 300Ω resistor is connected to it in parallel
B. An 80Ω resistor is conneceted to it in series
C. A 150Ω resistor is connected to it in parallel
D. A 240Ω resistor is connected to it in series

Question 123:

• JAMB 2014

Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3x10^-7kgC^-1]

A. 2.9x10⁵kg
B. 9.5x10^-7kg
C. 9.5x10^-3kg
D. 2.9x10⁴kg

Question 124:

• JAMB 2014

In a common emitter configuration, the output voltage is through the

A. Resistor
B. Base
C. Collector
D. Emitter

Question 125:

• JAMB 2017

Three 3ω resistance are connected in parallel what is the equivalent resistance?

A. 1ω
B. 9ω
C. 3ω
D. 0.33ω