Most electrical equipment is designed to operate at a nominal voltage which is usually + or - 10% of it’s rated voltage. If an appliance is opperating at lower than rated nominal voltage the current will _________ a. not change b. stop flowing c. go up d. go down
Question
Most electrical equipment is designed to operate at a nominal voltage which is usually + or - 10% of it’s rated voltage. If an appliance is opperating at lower than rated nominal voltage the current will _________ a. not change b. stop flowing c. go up d. go down
Solution
The answer is c. go up.
Here's why:
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Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points, and inversely proportional to the resistance (R). It is usually formulated as I = V/R.
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If the voltage decreases and the resistance stays the same (as we would expect in an appliance), the current must increase to maintain the same power output.
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Therefore, if an appliance is operating at lower than its rated nominal voltage, the current will go up to compensate for the decrease in voltage.
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