Question

An electric flashlight can be charged by turning a crank. Identify the types and order of energy changes happening.

a
Electric --> Heat --> Mechanical
b
Mechanical --> Electric --> Light
c
Electric --> Light --> Heat
d
Mechanical --> Heat --> Electric

Answer 1

The correct answer is:

**b. Mechanical --> Electric --> Light**

Here's the breakdown of the energy changes:

1. **Mechanical Energy**: When you turn the crank of the flashlight, you are using mechanical energy (the energy of motion).

2. **Electric Energy**: The mechanical energy is converted into electrical energy, which charges the flashlight's battery or powers the internal circuitry.

3. **Light Energy**: Finally, the electrical energy is converted into light energy when you turn on the flashlight.

So, the sequence of energy changes is indeed mechanical to electric to light.