What is the current through a 24-ohm resistor connected across 240 volts?

This question requires another straightforward application of Ohm's Law. To calculate the current (I), you must divide the applied voltage (E) by the resistance (R). By substituting the known values into the I = E / R equation, you get I = 240 volts / 24 ohms. Completing the math yields an even 10 amperes. A common mistake when rushing is to invert the division (24 / 240), which leads directly to the trap answer of 0.1 amperes. Always remember that voltage goes on top of the division fraction.