GCSE Physics

The ammeter reads 2 amps.

A 1 ohm resistor* is half as resistant as a 2 ohm resistor, so it is twice as easy for the current* to flow. The resistor allows twice the 1 amp current to pass.

By Ohm's Law:

V = IR

Solving for I:


Now replacing the symbols with the values given:


2 = I

I = 2 amps

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