Question

A 210 Ohm resistor uses 9.28 W of

power. How much current flows
through the resistor?
(Unit = A)

Answer 1

• Resistance=R=210Ohm
• Power=9.28W=P

Current=I

`\boxed{\sf P=I^2R}`

`\\ \sf\longmapsto I^2=(P)/(R)`

`\\ \sf\longmapsto I^2=(9.28)/(210)`

`\\ \sf\longmapsto I^2\approx0.04`

`\\ \sf\longmapsto I\approx√(0.04)`

`\\ \sf\longmapsto I\approx\sqrt{(4)/(100)}`

`\\ \sf\longmapsto I\approx(√(4))/(√(100))`

`\\ \sf\longmapsto I\approx(2)/(10)`

`\\ \sf\longmapsto I\approx0.2A`