Question

Consider an electrical conductor connected across a potential difference $V$. Let $\Delta q$ be a small charge moving through it in time $\Delta t.$ If I is the electric current through it,
(i) the kinetic energy of the charge increases by $IV\Delta t$
(ii) the electric potential energy of the charge decreases by IV $\Delta t$.
(iii) the thermal energy of the conductor increases by IV $\Delta t$.
Then the correct statements is / are

• A. (i)
• B. (i), (ii)
• C. (i) and (iii)
• D. (ii), (iii)

Answer 1

Answer: (D)

As the charges flow from higher to lower potential, its potential energy decreases and increase in kinetic energy is transferred to conductor which increases the thermal energy.