amarangi
amarangi amarangi
  • 12-05-2021
  • Physics
contestada

What is the potential difference across a circuit that delivers 4.2A to a 500W motor?

Respuesta :

Numenius
Numenius Numenius
  • 17-05-2021

Answer:

Thus, the potential difference is 119 V.

Explanation:

Current, I = 4.2 A

Power, P = 500 W

The rate of doing work is called power.

The SI unit of power is Watt.

The  commercial unit of power is horse power.

1 horse power = 746 Watt

The formula of the electrical power is

P = V I

where, V is the voltage and I is the current.

Substitute the values in the formula

500 = 4.2 x V

V = 119 V

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