Resistance Of A Voltmeter

The effective resistance of the parallel combination is Reff = 50*50/(50+50) = 25 KΩ [Using formula, 1/Reff = 1/R1 + 1/R2 , where R1 and R2 are resistances which are connected in parallel] Hence, the voltage drop across the resistor= [25/(25+100)]150 = 30V (Using Voltage divider rule) Therefore, we see that Voltmeter A

Is the resistance of a voltmeter high or low?

Hence, voltmeter have very high resistance, and an ammeter have low resistance for accurate measurement of potential difference and current should be used.

What is the resistance of a voltmeter Why?

Therefore, the resistance of an ideal voltmeter will be infinite. Q. Statement A: An ideal voltmeter has infinite resistance.

Why is the resistance of a voltmeter high?

A voltmeter measures the voltage difference between the two different points (say, on different sides of a resistor), but it should not change the amount of current going through the element between these two points. So it should have very high resistance so mat it doesn't draw current through it.

What is the resistance of ammeter?

For the ideal case, resistance of an ammeter is zero. Therefore, ammeter is made by connecting resistance in parallel with the coil of a galvanometer. This parallel resistance is called shunt.

What is the formula for voltmeter?

The reading of the voltmeter can be determined by finding the potential difference across the 2Ω resistance by using the value of current in the circuit. V=IR, here V is the potential difference across a resistance R through which a current I is flowing. The ammeter is connected in series with the circuit.

Why the resistance of ammeter is low?

If the resistance of the ammeter would be high, the total resistance would be high. This would decrease the amount of current flowing through the circuit. Hence, in order to avoid the change of current flowing in a circuit. The resistance of an ammeter should be as small as zero.

Should the resistance of ammeter be low or high?

Ammeter should have very low resistance.

Should the resistance be low or high?

Solution : The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.

What is the resistance of voltmeter shown in the circuit?

In the circuit shown , the resistance of voltmeter is 10,000 Ω and that of ammeter is 20 Ω.

What does a voltmeter measure?

A voltmeter, also known as a voltage meter, is an instrument used for measuring the potential difference, or voltage, between two points in an electrical or electronic circuit.

What is the resistance of voltmeter when it is connected in parallel?

Ammeter has zero resistance and voltmeter has infinite resistance.

What if voltmeter has low resistance?

Note: The lower the resistance the voltmeter puts across the load, the more wrong the reading will be on the voltmeter.

What is the meaning of high resistance and low resistance?

Resistance is the ratio of electrical potential (voltage) to the current in a material. Simply put, a material with high resistance requires a high potential to generate a given amount of current in the material. A material with low resistance requires a low potential to generate the same amount of current.

Does an ammeter have high resistance?

Answer and Explanation: 1 ) Resistance of an ammeter is low. As ammeter is connected in series in the circuit, effective resistance is the sum of resistance of the circuit and the resistance of ammeter. Thus small resistance of ammeter would not effect the current in the circuit.

What is the resistance of ammeter and voltmeter?

Resistance of an ideal voltmeter is Infinite and that of an ammeter is zero. Was this answer helpful?

What is ideal voltmeter?

The ideal voltmeter is a theoretical concept of a voltmeter that does not influence the circuit, because the current to the ideal voltmeter is zero.

What is difference between ammeter and voltmeter?

Both of these devices are used in electric circuits but the major difference between a voltmeter and an ammeter is ammeter comes in handy for measuring the flow of current whereas the voltmeter comes in handy for measuring the voltage or emf across two points in an electric circuit.

What is the formula for resistance?

Parameters	Resistance	Resistivity
Formula	R = V I	ρ = E J
SI unit	Ω	Ω.m
Symbol	R	ρ
Dependence	Dependent on the length and cross-sectional area of the conductor and temperature	Temperature

How do you calculate total resistance?

To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula: Rtotal = R1 + R2 +R3 and so on.