Answer to Question #184384 in Electric Circuits for Jishnu

Question

Calculate the amperage of a device with power 460w and voltage 230v

Answer 1

Explanations & Calculations

• Those ratings of the device imply that it consumes a power of 460W exactly at an applied voltage of 230V.
• Lower the applied voltage, lower the power it consumes.

• With the use of the simple equation $\small P =Vi$, the amperage of the device can be calculated.
• Knowns — $\small V=230V$ and $\small \text{Power}\,=P=460W$
• Then,

$\qquad\qquad \begin{aligned} \small i&=\small \frac{P}{V}=\frac{460W}{230V}=\bold{2A} \end{aligned}$

• The device consumes that much of an amperage.