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# How to do calculate the A) total resistance B) the current in each resistor C) the P.D across each resistor. The battery is 20V then going from the positive terminal there is a parallel circuit with 10ohms and 8ohms which then connects to a 4ohms res?

1 answers

In parallel, the total resistance is found by using 1/total resistance = 1/R1 + 1/R2... so in this case 1/total resistance = 1/10 + 1/8 + 1/4. As this is a parallel circuit you always have the same p.d across each resistor. Then, the current is calculated using Current = p.d/resistance of each resistor. (Remember the p.d is the same as the source).