Resistors of 5 ohms and 10 ohms are connected in series with a battery supplying 3 volts. What is the total resistance ? And calculate the current in the circuit.

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For the first part of the question we note that the resistors are in series, this means we can simply add together the resistance, giving a value of:
15 ohms

For the second part we use the equation V=IR, 
substituting in the known voltage and calculated resistance:
3 = 15 * I
I = 3/15 = 0.2 Amps

Alexander N. GCSE Physics tutor, IB Physics tutor

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