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Unformatted text preview: t should be removed from the circuit and the circuit should be de‐energised. ) Fig. Measuring resistance with Ohmmeter Ammeter An ammeter is used to measure the current through an element. Hence, the ammeter is connected in series with the element so that the same current passes through both the ammeter and the element. The circuit has to be broken to insert the ammeter in the circuit. The ideal ammeter has zero resistance and hence does not affect the circuit. 31 EE1002 Introduction to Circuits and Systems iL iL ? A
A RL Vs RL Vs Fig. Measuring current using an ammeter Voltmeter A voltmeter measures the voltage between two points in a circuit (it could be two ends of an element in the circuit). Voltmeter is connected in parallel to the two points. It is not necessary to break the circuit for connecting the voltmeter. The ideal voltmeter has infinite resistance and connecting the voltmeter in parallel does not affect the circuit. Vs vL +
- Vs RL vL V
- Fig. Measuring the volt...
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