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2 years ago

The coils in a motor have a resistance of 0.14 Ω and are driven by an EMF of 62 V.

Physics

1 answer:

Brilliant_brown [7]2 years ago

7 0

The difference in the power required by the motor at start up and at operating speed is 9778.57

<h3>What is power? </h3>

This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:

Power (P) = voltage (V) × current (I)

P = IV

Power = square voltage (V²) / resistance ®

P = V² / R

<h3>How to determine the power by the EMF</h3>

Voltage (V) = 37 V
Resistance (R) = 0.14 Ω
Power by EMF (P₁) =?

P = V² / R

P₁ = 62² / 0.14

P₁ = 27457.14 watts

<h3>How to determine the power by the back EMF</h3>

Voltage (V) = 62 V
Resistance (R) = 0.14 Ω
Power by back EMF (P₂) =?

P = V² / R

P₂ = 37² / 0.14

P₂ = 9778.57 watts

<h3>How to determine the power difference</h3>

Power by EMF (P₁) = 27457.14 watts
Power by back EMF (P₂) = 9778.57 watts
Difference in power =?

Difference = P₁ - P₂

Difference in power = 27457.14 - 9778.57

Difference in power = 17678.57 watts

Learn more about electrical power:

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