WAEC Chemistry 2022 Paper

Concept:Quantity of electricity is the total charge that flows, calculated by multiplying current by the time for which it flows.Explanation:The formula for quantity of electricity is $Q = I \times t$.Here, current $I = 0.20$ A.Time is given in minutes, so convert it to seconds: $t = 60 \times 60 = 3600$ s.Substitute into the formula: $Q = 0.20 \times 3600$.Perform the multiplication to get $Q = 720$ C.Thus, the charge passed through the cell is 720 coulombs.Answer:The quantity of electricity used is $720$ C, which matches option D.