Want this question answered?
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.
We use the 250 ohms with the power supply because the internal resistance of a DC power supply is insufficient to develop a resistance.
The battery is used by the meter to apply a voltage across the resistance being measured and determine the current which determines the resistance. If there is no battery it can't supply the voltage and can't measure current, so no reading.
If you put a current of 1 amp through a resistor, the voltage across it is equal to the resistance in ohms. This can also be done with lower currents and then the result must be multiplied up in the right ratio. An ohmmeter, or the ohm scale on a multimeter, uses a battery to supply the current.
No. You must use a ground (earth) resistance tester, such as a earth-resistance megger. Apart from the practical requirements for making the test (too long to explain in this answer), a digital multimeter uses a DC supply, which acts to polarise the chemicals in the soil, giving false readings. ANSWER: YES you can but only if there is appreciable Resistance to measure. THERE ARE MANY GROUNDS EARTH IS ONE OF THEM
a meter uses its own supply to measure resistance. you dont have to remove the resistor from the circuit but you must isolate it from the circuit supply to get an accurate reading.
supply should be off
multimeter
We can reduce the supply voltage from the ohms law relation.......v=ir... resistance is directly proportional to supply voltage...or.....we can control the resistance by the relation by R is directly proportional to l/a l=length a=area
Turned Off!
it determines how well the current flows through the wires. ANSWER: When there is no outside power connected to it. But some power is necessary to read the resistance so the meter battery will supply the current necessary to measure the IR drop and translate that to 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.
actually we can measure the static and dynamic resistance in dc supply mode . static resistence vf/if dynamic resistance vf1-vf2/if1-if2 elumalai.r
We use the 250 ohms with the power supply because the internal resistance of a DC power supply is insufficient to develop a resistance.
If additional resistance is connected in parallel with a circuit the supply voltage will decrease?
No change in supply voltage as additional resistance is connected in parallel circuit.
The battery is used by the meter to apply a voltage across the resistance being measured and determine the current which determines the resistance. If there is no battery it can't supply the voltage and can't measure current, so no reading.