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Ideally true, but seldom so. The vast majority of resistance meters use current to measure resistance and just use V=IR to give R - the resistor is in a circuit carrying current. The only method that does not have a current through the resistance, it actually relies on the fact, is a Wheatstone bridge. The most important reason for not having a current is that you will be using a current in most cases, to meaure the resistance. Current from another source will screw the reading. Also, with a current flowing, you are not measuring resistance - you are measuring impedance - a combination of inductance and resistance.
What else can I help you with?
How do you measure the resistance in a parallel circuit?
You have to measure the voltage, and the current. The resistance is then calculated by using Ohm's Law.
How do you measure alternating current voltage and resistance?
You measure current by inserting an amp meter in series with the circuit or using a clamp-on meter to measure current by induction. You measure voltage with a volt meter across the supply. You measure resistance in ohms across the resistance. Luckily all these functions are in the same meter in most cases.
What are applications of OHM METER?
It measures resistance in a component or circuit to determine if there is a break in that circuit or component. If there's no resistance, it means there's a break, as no electrical current is passing through.
What is the unit to measure the opposition to the flow of electrical current called?
Answer: Inductive reactance is the opposition to the change in current in an electrical circuit and is abbreviated Xl. Answer: The opposition to current flow is called resistance (for DC), or impedance (for AC; often just called resistance); the unit for both is the ohm.
What instrument measures electrical earth resistance?
A multimeter device can measure resistance, current, AC/DC voltage, and it also can determine continuity on an electrical circuit, and its range for current, voltage and resistance is widely variable.
Why would never measure resistance in a circuit carrying a current?
If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument.
The number of ohms in a circuit is a measure of the?
resistance to the flow of electrical current in the circuit. It is a measure of how much opposition the circuit presents to the flow of electricity. The higher the number of ohms, the greater the resistance in the circuit.
How do you measure the resistance in a parallel circuit?
You have to measure the voltage, and the current. The resistance is then calculated by using Ohm's Law.
What are the 3 ways to measure electricity in circuit?
The three ways to measure electricity in a circuit are voltage, current, and resistance. Voltage is the measure of electrical potential difference between two points, current is the flow of electric charge in a circuit, and resistance is the opposition to the flow of current.
How do you measure alternating current voltage and resistance?
You measure current by inserting an amp meter in series with the circuit or using a clamp-on meter to measure current by induction. You measure voltage with a volt meter across the supply. You measure resistance in ohms across the resistance. Luckily all these functions are in the same meter in most cases.
When an ammeter is connected to measure current circuit current will decrease sightly because R total decreases after the meter is inserted?
Current will be decreased because of the resistance of the ammeter added to the circuit's resistance. In other words total resistance increases.
1 What is the effect caused by the ammeter resistance when an ammeter is inserted into a circuit to measure the current?
An ammeter has a finite resistance which is inserted in series with the rest of the circuit, increasing the total resistance and decreasing the current. A good ammeter has a very low resistance, so it shouldn't affect the circuit noticeably.
What are watts amps and ohms?
ohms is a measure of resistance(R) in a circuit. Watts is a measure of the power(P), in this case lets assume it is the power used by the resistive element (lamp, heater etc). Power(watts)=Current(Amps)x Current(amps) x Resistance(ohms) or Resistance (ohms)=Power(W)/(current x current)
How do you find resistance when you have current and resistance total?
If you are looking for the resistance of each resistor in either a series circuit or a parallel circuit you must measure the current I and the voltage V for each resistor. Then calculate its resistance using Ohms Law R = V / I where I = current (Amps), V = voltage (Volts) and R= resistance (Ohms).
What instrument measures electrical pressure in a circuit?
A multimeter is commonly used to measure electrical pressure in a circuit. It can measure voltage, current, and resistance, providing a comprehensive view of the electrical characteristics in the circuit.
What is the current in amps flowing through the circuit?
To determine the current in amps flowing through the circuit, you need to use Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R). The formula is I V / R. Measure the voltage across the circuit and the total resistance of the circuit, then plug the values into the formula to calculate the current in amps.
What is resistance and how is it defined in electrical terms?
Resistance is the measure of how much a material or component opposes the flow of electric current. In electrical terms, resistance is defined as the ratio of voltage to current in a circuit, measured in ohms.
