Question

the wattage rating W (in watts) of an appliance varies directly with the square of the current I (in amperes) and directly with the resistance R (in ohms). If the wattage is 6 watts when the current is 0.2 ampere and the resistance is 150 ohms, find the wattage when the current is 0.3 ampere and the resistance is 300 ohms.

Answer 1

$P = I\cdot V \text{, where P is power in Watts, I is current and V is in Volts.}$, but

$V = R\cdot I \text{, where V is in Volts, R is resistance and I is current.}$

Doing the math:

$P = I\cdot V$

$P = I\cdot R\cdot I$

$P = R\cdot I^2$

$P = 300^2\cdot 0.3$

$P = 27000$

Answer 2

Answer:

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Step-by-step explanation:

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