Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 4Ω in series with a combination of two resistors (8Ω each) in parallel and a voltmeter across parallel combination. Each of them dissipate maximum energy and can withstand a maximum power of 16W without melting. Find the maximum current that can flow through the three resistors.

Answer

Maximum current through 4 Ω resister = √(P/R)

= √(16/4) = 2 A

Maximum current through each 8 Ω resister = ½ × 2 = 1 A

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