What are the considerations before using an ammeter?
Ammeters must always be connected in series with the circuit under test. Always start with the highest range of an ammeter. Turn OFF and discharge the circuit completely before you connect or disconnect the ammeter. In dc ammeters, observe the proper circuit polarity to prevent the meter from being damaged.
What are the precautions taken while using a DC voltmeter?
Always start with the highest range of a voltmeter. Deenergize and discharge the circuit completely before connecting or disconnecting the voltmeter. In dc voltmeters, observe the proper circuit polarity to prevent damage to the meter. Never use a dc voltmeter to measure ac voltage.
What are two important things to remember about the voltmeter?
The most important thing to remember is that the voltmeter should be connected in parallel with the light bulb. That means you can always connect the voltmeter last. You do not have to disconnect any circuit elements in order to properly add a voltmeter to a circuit.
How does an ammeter work?
Ammeters work to measure electrical current by measuring the current through a set of coils with a very low resistance and inductive reactance. If the ammeter were connected in parallel, the path may become short-circuited such that all the current will flow through the ammeter instead of the circuit.
Where should voltmeter be placed?
A voltmeter is placed in parallel with the voltage source to receive full voltage and must have a large resistance to limit its effect on the circuit. An ammeter is placed in series to get the full current flowing through a branch and must have a small resistance to limit its effect on the circuit.
What will happen if the meter is connected the wrong way?
IF the meter is connected correctly ALL energy needed for its internal use is not charged for it is drawn before metering (it will be part of the utility energy losses). If the meter is connected wrongly the user will have to pay for the energy used. To test this.
What happens if the ammeter is connected in parallel?
When ammeter is connected in parallel to the circuit, net resistance of the circuit decreases. Hence more current is drawn from the battery, which damages the ammeter.
What will happen if a voltmeter is connected in series?
IF VOLTMETER OR VOLTAGE IS CONNECTED IN SERIES THEN DUE TO HIGH RESISTANCE NO CURRENT WILL FLOW THROUGH CIRCUIT SO NO VOLTAGE DROP OCCUR.
What happens if a voltmeter is connected in series 10?
The voltmeter has a high resistance. When a high resistance voltmeter is connected in series it will not have any current to flow through the circuit. Therefore, a voltmeter connected in series acts more like a resistor and not as a voltmeter.
Can a voltmeter complete a circuit?
One of the most commonly used functions of a multimeter is the voltmeter. The voltmeter can take measurements throughout a circuit and tell technicians the difference in voltage between two points. The voltmeter can be used to measure voltage drop.
Why does voltmeter have high resistance?
A voltmeter measures the difference in voltage between the two different points (say, on opposite sides of a resistor), but it does not adjust the amount of current passing between these two points through the device. It will therefore have very high resistance, so that it does not draw current through it.