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07 Sep 2021 02:45 PM study24x7

Resistance is a measure of a material’s opposition to

#neetmcq #neetquestions #physicsmcq

voltage

current

electric force

movement of protons

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Edubabble LLP

Resistance is a measure of the opposition to current flow in an electrical circuit.
Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).
Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.
He is credited for formulating Ohm's Law.
Resistance cannot be measured in an operating circuit.
Accordingly, troubleshooting technicians often determine resistance by taking voltage and current measurements and applying Ohm's Law:

E = I x R That is, volts = amps x ohms. R stands for resistance in this formula. If resistance is unknown, the formula can be converted to R = E/I (ohms = volts divided by amps).

Examples: In an electric heater circuit, as portrayed in the two illustrations below, resistance is determined by measuring circuit voltage and current, then applying Ohm's Law.

Reply 16 Sep 2021 02:41 PM

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