A lamp having a resistance of 10 OHM is connected across 18 V battery. What is the current through the lamp?

Using Ohms law ... E = I * R

Where

E is electromotive force in volts

R is resistance in Ohms

I is the current in amps (why "I", I don't know maybe some one else can edit this line)

E = 2 amps * 10 ohms = 20 volts