Using your three formulas for power, how does the power change if: The voltage i
ID: 1512800 • Letter: U
Question
Using your three formulas for power, how does the power change if:
The voltage is doubled (if you change voltage then something else has to change (according to Ohm's Law), so use the equation where only V is changed).
It will (increase/decrease)_____________ by ________________times
The current is doubled and the resistance is doubled.
It will (increase/decrease)_________ by _____________times
The voltage is doubled and the resistance is halved.
It will (increase/decrease)__________ by __________times.
Explanation / Answer
Power = V i or i^2 R or V^2/R
V is Volatge
i is current
R is resistance
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when V is doubled,
POwer P = V^2/R = 4V^2/R
P increases by 4 times
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so if i is doubled and R is doubles , P = (2i)^2 * 2R = 4 i^2 R
ANSWER 2---> It will (increases)_ by 4 times when The current is doubled and the resistance is doubled.
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if Vis doubled and R is halved
P = 4V^2/R/2 = 8 V^2/R
so
It will (increase by 8 times when the voltage is doubled and the resistance is halved.
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