GCSE Physics The ammeter reads 1 amp.

A 4-ohm resistor* is twice as resistant as a 2-ohm resistor, so it is twice as hard for the current* to flow. The resistor allows half of the 2 amp current to pass.

By Ohm's Law:

V = IR

Solving for I:


Now replacing the symbols with the values given:


1 = I

I = 1 amp

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