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The significance of a resistance reading depends on the component being tested. In general, resistance of any one component varies over.
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6 FAQs about [Do I need to turn off the power when measuring the resistance of photovoltaic panels ]
How do you measure resistance with an analog multimeter?
When measuring resistance with an analog multimeter, switch off power to the circuit under measurement. Plug the red test lead into the positive input terminal with the “+” mark and the black test lead into the COM input terminal. Switch the instrument to Ω mode and set the range button as appropriate based on the circuit’s anticipated resistance.
How do you measure resistance on a circuit board?
When working on a circuit board, it may be necessary to lift one of the leads of the resistor from the board to measure the correct resistance of the resistor. The resistance measurement displayed by a digital multimeter is the total resistance through all possible paths between the test lead probes.
Can you measure the resistance of a live circuit?
You can measure the voltage and the current of a live circuit and use those figures to calculate the resistance (Ohm’s Law), but you can’t actually measure the resistance of a live circuit. For a number of reasons, you need to turn the power off and measure the resistance of individual pieces of the circuit.
Why do I need to turn the power off?
For a number of reasons, you need to turn the power off and measure the resistance of individual pieces of the circuit. Or, to use the language we offered last week, a resistance measurement is taken with the circuit unpowered, in series with a portion of the circuit.
How do you determine a circuit's resistance?
When a current is applied to the circuit under measurement, the circuit (resistance) exhibits a voltage (or more precisely, a voltage drop). Resistance can be calculated by measuring the current and voltage using Ohm’s Law. As a result, a circuit’s resistance value can be determined if the current and voltage measured values are known.
How do you measure the resistance of a lightbulb?
Measuring the resistance of a lightbulb using a multimeter. Notice how the lightbulb has been disconnected from the circuit. The multimeter supplies its own small amount of current, which allows it to measure the resistance.