Batteries are usually identified by their voltage. Which battery would be able to give 18 joules of energy to 12 coulombs of charge?

Question 7 options:

1.5 Volt battery

216 Volt battery

9 Volt battery

12 Volt battery

6 Volt battery

3 Volt battery

Explanation:

Given parameters:

Electrical energy  = 18J

Quantity of charge Q = 12C

Unknown:

Voltage  = ?

Solution:

The expression of electrical potential energy is given as:

      Electrical potential energy  = c v²

c is the quantity of charge

v is the voltage

           18  =    x 12 x v²  

           18 = 6v²  

              v² = 3  

               v = 1.7v