C: energy, J
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A transformer connected to a 240V mains supply is used to light a 24 W lamp. The input current to the transformer is …
A polythene rod is rubbed with a duster. The duster then attracts small pieces of paper. Are the rod and the duster c…
The voltage/current graph for a filament lamp is shown. The voltage across the lamp increases. What happens to the te…
When a refrigerator is switched on for the first time, the air surrounding the ice-box is cooled. What happens to the…
An ice-cube has a mass of 7.50 g. The ice-cube is at 0°C. Heat from the surroundings reaches the ice-cube at an avera…
A bimetallic strip made from brass and iron is used as a thermostat. When the strip is heated, the brass expands more…