A 30-ohm resistor is connected across a 6-volt battery. What current does it draw?

To find the current flowing through the circuit, you must use the Ohm's Law formula for current: Current (I) equals Voltage (E) divided by Resistance (R), often written as I = E / R. Plug the provided values directly into the formula: I = 6 volts / 30 ohms. Performing this division gives you 0.2 amperes. Be careful not to invert the formula (dividing resistance by voltage, which would result in 5) or mix up the arithmetic (such as confusing 6/30 with 30/60). Applying the correct E / R sequence guarantees the correct answer of 0.2 amperes.