DC power (in watts) is calculated using the formula P = I ^ 2R, where I is the current (in amperes)

DC power (in watts) is calculated using the formula P = I ^ 2R, where I is the current (in amperes), R is the resistance (in ohms). Using this formula, find the resistance R (in ohms) if the power is 144 W, and the current is 6 A.

Using the given formula P = I ^ 2 * R, we find that the resistance is equal to the power divided by the current squared:
R = P / I ^ 2.
To reduce amperes in the numerator and denominator, you need to write W as the product of B * A (volt multiplied by ampere).
R = 144 W / (6A * 6A) = 144 V * A / 6 A * 6 A = 4 V / A = 4 ohms.
Answer: 4 ohms.