A circuit consists of two resistors in parallel. If they have resistances of 4 Ω and 12 Ω, what will be (a) the current through each resistor and (b) the total power dissipated when a potential...

A circuit consists of two resistors in parallel. If they have resistances of 4 Ω and 12 Ω, what will be (a) the current through each resistor and (b) the total power dissipated when a potential difference of 4 V is applied across the circuit?