Question

State the energy changes that occur in the following

a. The unwinding of a watch spring--

b. Burning coal while operating a steam engine---

c. Lighting of a torch bulb--

d. Working of an electric generator--​

Answer 1

Answer:

• Muscular energy is converted into elastic potential energy of the spring. Thanks ! Potential energy to kinetic energy.
• Chemical energy of coal first changes to heat energy of steam and then heat energy changes into mechanical energy.
• An incandescent light bulb consists of a vacuum-sealed glass chamber with a thin wire filament inside. When electricity passes through the wire, resistance causes it to heat up. This conversion of electricity to heat is the second energy conversion in a typical flashlight. This is done with nearly 100% efficiency.
• generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field

Answer 2

Answer:

a. Potential energy changes into Kinetic energy

b. Chemical energy changes into Mechanical energy

c. Chemical energy to Light and Heat energy

d. Mechanical energy to Electrical energy

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