能量轉移：练习题

Which of the following energy resources is classified as non-renewable?

A battery transfers \(180\text{ C}\) of charge through a light bulb. If the potential difference across the bulb is \(12\text{ V}\), calculate the total energy transferred.

The National Grid uses step-up transformers to increase the potential difference to very high levels for transmission. Why does this improve the efficiency of the energy transfer?

In a closed system, which of the following statements correctly describes the principle of conservation of energy when the system undergoes a change?

A hairdryer is connected to the mains supply and draws a current of \(4.0\text{ A}\). If the resistance of the heating element is \(50\text{ }\Omega\), calculate the power of the hairdryer using the formula \(P = I^{2} R\).

Calculate the energy transferred by a \( 2.5\text{ kW} \) electric kettle when it is switched on for \( 60\text{ seconds} \).