What voltage is needed to supply a current of 200 milliamperes to operate a relay that has a resistance of 25 ohms?

Solving this problem involves using the Ohm's Law formula for voltage: Voltage (E) equals Current (I) multiplied by Resistance (R). The primary challenge here is unit conversion. The current is given as 200 milliamperes, which must be converted to base units (amperes) before multiplying. Since 1000 milliamperes equal 1 ampere, 200 milliamperes is equal to 0.2 amperes. Once converted, multiply the current by the resistance: 0.2 amperes x 25 ohms = 5 volts. If you forget to convert the current from milliamperes, your result will be drastically off, making distractors like 50 volts look deceptively appealing due to decimal shifts.