WAEC Physics 2021 Paper

Concept:When the voltage of the battery is increased, the current in the circuit increases, which also raises the temperature and resistance of the resistor.Explanation:Ohm's law gives $V = IR$, where $V$ is the voltage, $I$ is the current, and $R$ is the resistance.If the battery voltage $V$ is increased, the current $I$ flowing through the resistor increases.The power dissipated in the resistor is $P = I^2 R$.A larger current produces more heat per second in the resistor.This extra heat causes the temperature of the resistor to rise.For a typical metallic resistor, resistance increases as temperature increases.Therefore, when the voltage increases, the current, resistance, and temperature all increase.Answer:B. current, resistance and temperature.