Draw the electric circuit the help of a battery volltmeter ammeter resistance and connect ing wire
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The Voltmeter - is always across the circuit or element being measured. The circuit does not require to be opened or otherwise usually.
But since the circuit may well be affected by the capacitor and source noise of the test probe lead, special probes may be required to isolate measurement and not degrade the circuit being measured, as with the oscilloscope that is the most common “voltmeter” used in circuit analysis and testing. The do this with special probes.
The Ammeter - is always in series with the current being measured.
Therefore ammeters are a nuisance in testing because of the need to open the circuit to wire in the ammeter. If the current is AC rather than DC, the AC current can be read without opening the wire using the principle of a 1-turn transformer. Such instruments are in the toolbox of most electrical technicians.
The most common measurement tool is the multimeter, that combines in it the ability to measure AC and DC, Volts, Amps and Resistance. Here is a tutorial that covers these.
But since the circuit may well be affected by the capacitor and source noise of the test probe lead, special probes may be required to isolate measurement and not degrade the circuit being measured, as with the oscilloscope that is the most common “voltmeter” used in circuit analysis and testing. The do this with special probes.
The Ammeter - is always in series with the current being measured.
Therefore ammeters are a nuisance in testing because of the need to open the circuit to wire in the ammeter. If the current is AC rather than DC, the AC current can be read without opening the wire using the principle of a 1-turn transformer. Such instruments are in the toolbox of most electrical technicians.
The most common measurement tool is the multimeter, that combines in it the ability to measure AC and DC, Volts, Amps and Resistance. Here is a tutorial that covers these.
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