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# Measuring Current

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### Measuring Current

1. 1. The unit of measure for current is the &quot;amp&quot; 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. 2. Experiment: measuring current R 1 1 2 A <ul><li>Set up the circuit as shown above. </li></ul><ul><li>Measure the current using the ammeter at positions 1 and 2. </li></ul>Circuit 1 A
3. 3. R2 1 2 3 A A A <ul><li>Add another component into the circuit. </li></ul><ul><li>Now measure the current using the ammeter at positions 1, 2 and 3. </li></ul>Circuit 2 Experiment: measuring current R1
4. 4. Results Current Position 1 Current Position 2 Current Position 3 Current Position 1 Current Position 2 Circuit 1 Circuit 2
5. 5. Measuring current in parallel circuits <ul><li>Place the ammeter, in turn, at positions 1, 2, 3 and 4. </li></ul><ul><li>Record the ammeter reading at the points in the table shown. </li></ul>A 1 A 2 A 3 A 4 1 2 3 4 A 4 A 3 A 2 A 1 Current (A) Ammeter