In 10 s, a charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit as a result.

(a) What is the p.d. across the battery?

(b) What current flows from the battery?

If the charge on an electron is 1.6 x I0^-19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1-ampere current?

The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:

(a) a charge of 1 C passes through it?

(b) a charge of 5 C passes through it?

(c) a current of 2 A flows through it for 10 s?

Define electric current. What is the SI unit of electric current.

One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?