Table of Contents
- 1 How would the equivalent resistance of the circuit be affected if the ammeter is incorrectly connected in parallel with the load Why?
- 2 What happens if ammeter is connected incorrectly?
- 3 When resistance are connected in parallel then what is the impact on the equivalent resistance of the circuits?
- 4 What is the effect of the ammeter internal resistance on the measured resistance?
- 5 Why does a voltmeter have a high resistance?
- 6 What will happen to the current through a circuit if the resistance is decreased?
- 7 Why does an ammeter have to have a low resistance?
- 8 Why is an ammeter connected in series to measure current?
How would the equivalent resistance of the circuit be affected if the ammeter is incorrectly connected in parallel with the load Why?
Ammeter has very low resistance. If connected in parallel, the equivalent resistance will become lesser than the resistance of ammeter. For constant voltage, there will high increase in the value of current, this may damage the circuit.
What happens if ammeter is connected incorrectly?
Ammeter aims at measuring the current flowing through the circuit and hence, it is connected in series. 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.
How would the circuit be affected if the voltmeter is incorrectly connected in series with load?
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 would happen if you were measuring voltage but accidentally put the meter in the ammeter mode?
25. Suppose you are using a multimeter (one designed to measure a range of voltages, currents, and resistances) to measure current in a circuit and you inadvertently leave it in a voltmeter mode. If you put the meter in ammeter mode to measure voltage, you would instead measure current.
When resistance are connected in parallel then what is the impact on the equivalent resistance of the circuits?
If the two resistances or impedances in parallel are equal and of the same value, then the total or equivalent resistance, RT is equal to half the value of one resistor.
What is the effect of the ammeter internal resistance on the measured resistance?
Just like voltmeters, ammeters tend to influence the amount of current in the circuits they’re connected to. However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as current flows through it.
What will happen to the ammeter and to the circuit if the conventional ammeter is accidentally connected in parallel or across the load?
An ammeter has a very low internal resistance. So, if it is connected in parallel with a load, it will short-out that load in resulting a high current flowing through the ammeter may severely damage the ammeter (and possible harm the user), although most are fitted with fuses to protect them.
What happened if we connect a voltmeter in series of a circuit?
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.
Why does a voltmeter have a 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.
What will happen to the current through a circuit if the resistance is decreased?
But current is also inversely proportional to the resistance; a halving of the resistance will double the current.
What is the effect on the electric current in the circuit if the voltage is doubled?
The current is directly proportional to the voltage and inversely proportional to the resistance. Any alteration in the voltage will result in the same alteration of the current. So doubling or tripling the voltage will cause the current to be doubled or tripled.
What happens if you connect an ammeter in parallel?
Since the ammeter is a low impedance device, connecting it in parallel with the circuit would cause a short circuit, damaging the ammeter and/or the circuit. It should be connected in series, so that maximum current can pass through it, for accurate measurement of current.
Why does an ammeter have to have a low resistance?
Most Ammeters and voltmeters use some of the current and voltage from the circuit being tested to operate. The ammeter must have a very low resistance because it is connected in series. We want all the circuit current to go through the ammeter to measure the current accurately.
Why is an ammeter connected in series to measure current?
In this way it doesn’t have any effect on the original circuit. If Ammeter is connected in parallel than because of it’s low resistance large amount of current will flow through it instead of the original circuit. Hence Ammeter is connected in series to measure current.
How does the resistance of a voltmeter affect voltage measurement?
The very act of connecting the voltmeter to the circuit makes it part of the circuit, and the voltmeter’s own resistance alters the resistance ratio of the voltage divider circuit, consequently affecting the voltage being measured.