Which statement about power is correct?

1. The power of a light bulb labelled '12 V, 2 A' is 6 W. If the light bulb is
switched on for 5 hours then 430 kJ of energy are transferred.

2. A powerful appliance transfers less energy per second, so a more powerful
lamp is dimmer than a less powerful one.

3. Potential difference is the power transferred per unit charge, and the current
is the charge that flows per second.

4. The power of a travel kettle labelled '24 V, 5 A' is 120 W. If it heats water for
15 minutes then 108 000 J of energy are transferred.

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?