Which combination of the current in a resistor and the time for which it is present results in a charge of 180 C passing through the resistor?
a current of 4.0 A4.0\text{ A}4.0 A for 45 s45\text{ s}45 s
a current of 3.0 A3.0\text{ A}3.0 A for 60 minutes60\text{ minutes}60 minutes
a current of 2.0 A2.0\text{ A}2.0 A for 90 minutes90\text{ minutes}90 minutes
a current of 6.0 A6.0\text{ A}6.0 A for 30 minutes30\text{ minutes}30 minutes
145 exam-style questions on CIE IGCSE Physics 4.2.1a Positive and negative charge. Each one has a worked solution and a mark scheme showing where the marks go.