A student wants to measure the electrical resistance of a material in practical units. Which of the following units would be the most appropriate for this purpose?
Joule
Newton
Ohm
Watt
Ohm is the practical unit of electrical resistance, symbolised by the Greek letter omega (Ω). One ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt applied across these points produces a current of one ampere in the conductor.
The other options, joule (a), newton (b), and watt (d), are not appropriate units for measuring electrical resistance.
Joule (a) is the unit of energy and is commonly used to measure work or heat. It is not related to electrical resistance directly.
Newton (b) is the unit of force, and is commonly used to measure weight or force. It is not related to electrical resistance.
Watt (d) is the unit of power and is commonly used to measure the rate at which energy is transferred or used. It is related to electrical resistance but indirectly, as power is calculated by multiplying the voltage across a circuit by the current flowing through it.
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