How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?

To calculate the power consumed when only current and resistance are known, use the formula P = I^2 × R (Power equals Current squared times Resistance). Before doing the math, you must convert the current from milliamperes to standard amperes. A current of 7.0 milliamperes is equal to 0.007 amperes. Next, square the current: 0.007 × 0.007 = 0.000049. Finally, multiply that result by the resistance of 1,250 ohms (0.000049 × 1250). This equals 0.06125 watts. Since the answers are presented in milliwatts, convert back by multiplying by 1,000, which gives approximately 61 milliwatts.