Question

Draw a circuit diagram of an electric circuit containing a cell a key ammeter a resistor of 4 ohm in series with a combination of two resistors 8ohm in parallel and voltmeter across parallel combination is of them dissipate maximum energy and can with stand a maximum power of 16 but without melting find the maximum current can flow through the three resistors

Answer 1

The circuit is shown as the figure:

Effective resistance of combination of two resistors (4 ohms each) in parallel is 

Since, the resistor of 2 ohms and parallel combination of two 4 ohms resistors are in series, same current will flow through these. Hence, the potential difference across 2 ohms resistor is same as that across combination of two resistors.