A valt mwter cannot read the exact emf of a cell.wht?
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Answer:
By the end of this section, you will be able to:
Explain why a voltmeter must be connected in parallel with the circuit.
Draw a diagram showing an ammeter correctly connected in a circuit.
Describe how a galvanometer can be used as either a voltmeter or an ammeter.
Find the resistance that must be placed in series with a galvanometer to allow it to be used as a voltmeter with a given reading.
Explain why measuring the voltage or current in a circuit can never be exact.
Voltmeters measure voltage, whereas ammeters measure current. Some of the meters in automobile dashboards, digital cameras, cell phones, and tuner-amplifiers are voltmeters or ammeters. (See Figure 1.) The internal construction of the simplest of these meters and how they are connected to the system they monitor give further insight into applications of series and parallel connections.
Explanation:
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