Measurement of Alternating Quantities
Category : JEE Main & Advanced
Alternating current shows heating effect only, hence meters used for measuring ac are based on heating effect and are called hot wire meters (Hot wire ammeter and hot wire voltmeter)
Measurement of ac and dc
| ac measurement | dc measurement |
| (1) All ac meters read r.m.s. value. | (1) All dc meters read average value |
| (2) All ac meters are based on heating effect of current. | (2) All dc meters are based on magnetic effect of current |
|
(3) Deflection in hot wire meters \[\theta \propto i_{rms}^{2}\]
(non-linear scale) |
(3) Deflection in dc meters \[\theta \propto i\]
(Linear scale) |
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