Current (GCSE Physics)
Current
Current
Calculating Current
The current flowing through a component depends on two things: the resistance of the component and the potential difference across the component. If we are given two of the current, voltage and resistance, we can calculate the third.
Where:
• potential difference, V, in volts, V
• current, I, in amperes, A (amp is acceptable for ampere)
• resistance, R, in ohms, Ω
Measuring Current
The current flowing through a component is measured by an ammeter.
An ammeter must be connected in series. In series circuits, current is the same everywhere in the circuit (as we will see later on), so it doesn’t matter where the ammeter is placed in the circuit.
Current is measured in amperes (A).
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