Physics · Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel
Which of the following devices has a source of emf inside it?
Which of the following devices has a source of emf inside it?
- A. Voltmeter
- B. Ammeter
- C. ohm-meter
- D. Rectifier
Step-by-step solution
An ohm-meter measures resistance by applying a known voltage (from an internal battery, which is a source of emf) to the unknown resistor and measuring the resulting current. The other devices (voltmeter, ammeter, rectifier) typically do not have an internal source of emf.
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