Measuring Current
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The unit of measure for electric current is the amp (A). An ammeter, which is connected in series, is used to measure current through a circuit component. When measuring current at multiple points in a circuit, the ammeter must be moved and the reading recorded at each position.
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Measuring Current
- 1. The unit of measure for current is the "amp" which has the symbol A. We measure the current using a device called an ammeter. In a circuit this is given the symbol When measuring the current through a component, the ammeter is always connected in series (in the same loop) with that component. A Measuring current A A
- 2. Experiment: measuring current R 1 1 2 A Set up the circuit as shown above. Measure the current using the ammeter at positions 1 and 2. Circuit 1 A
- 3. R2 1 2 3 A A A Add another component into the circuit. Now measure the current using the ammeter at positions 1, 2 and 3. Circuit 2 Experiment: measuring current R1
- 4. Results Current Position 1 Current Position 2 Current Position 3 Current Position 1 Current Position 2 Circuit 1 Circuit 2
- 5. Measuring current in parallel circuits Place the ammeter, in turn, at positions 1, 2, 3 and 4. Record the ammeter reading at the points in the table shown. A 1 A 2 A 3 A 4 1 2 3 4 A 4 A 3 A 2 A 1 Current (A) Ammeter