Calculating Back EMF: 200V DC Motor w/ 20A, 0.3Ω Resistance

AI Thread Summary
To calculate the back EMF of a 200V DC motor with a 20A current and a resistance of 0.3Ω, apply Kirchhoff's Voltage Law (KVL). The back EMF can be determined by subtracting the voltage drop across the armature resistance from the supply voltage. The voltage drop is calculated as the product of current and resistance (20A * 0.3Ω = 6V). Thus, the back EMF is 200V - 6V, resulting in 194V. This method effectively clarifies the calculation process for back EMF in DC motors.
jaykc1
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Homework Statement



i have a 200v dc motor with 20A flowing through the armature with a resistance of 0.3Ω, how do i calculate the back emf? very confussed :(

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The Attempt at a Solution

 
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Thanks for your help, not so confussed now :)
 

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