1.7.2 Work (3)

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1.

A 10 A current flows through a resistor of 10 ohms. Calculate the electrical power dissipated by the resistor. Explain how this electrical power relates to the energy transferred in a circuit. Include a brief explanation of the relationship between power, energy, and time.

2.

A student applies a force of 25 N to a block of wood, moving it 0.5 m across a level surface. Calculate the amount of mechanical work done by the student.

3.

A student pushes a box across a rough floor with a constant force of 20 N for a distance of 5 metres. The coefficient of kinetic friction between the box and the floor is 0.3. Calculate the amount of work done by the student on the box. Show your working.