Question

find the power of a device running at 230 v when the resistance is 15 ohms?​

Answer 1

Explanation:

Given:

• Voltage = 230 V
• Resistance = 15 Ω

To find:

• Power consumed = ?

Solution:

For solving this question, a simple formula of Power is to be used

Power = Voltage × Current

In short it can be written as

P = VI

⇒ P = 230 × 15

⇒ P = 3450 W

⇒ P = 3.45 kW

∴ Power consumed by the device = 3.45 kW

KNOW MORE:

• Ohm's law → V = I × R
• Derivation of used formula:

We know that:

Power = Energy ÷ Time

⇒ Power = I²Rt ÷ t

⇒ Power = I²R

⇒ Power = IR × I

⇒ Power = VI [∵Ohms law]