Question

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 Ω in series with a combination of two resistors (4 Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Ω resistor be the same as that across the parallel combination of 4Ω resistors? Give reason.

Answer 1

Total resistance for parallel combination of 3 resistors can be calculated as follows: 

1/R = 1/4 + 1/4 

= 1/2 

R= 2 Ω

Total resistance of the parallel combination is also 2 ohm (2 Ω ).