Question

choose the best answers.

1. john is an electrician working on a high-voltage power line. he needs to touch the power line in order to connect a new wire. he is wearing rubber gloves to protect himself from getting shocked.

the rubber gloves are ____.
a. conductors b. insulators c. current stoppers

1. the metal on a car lets heat travel easily through it.

the metal is a(n) ____.
a. insulator b. conductor c. convection current

1. what type of energy transformation takes place in a flashlight?

a. chemical energy to mechanical energy
b. kinetic energy to electrical energy
c. sound energy to electrical energy
d. chemical energy to electrical energy to light energy

1. when a person eats an apple with sugar in it and then walks, what happens to the energy in the apple?

a. the energy changes from mechanical to chemical.
b. the energy changes from chemical to mechanical.
c. the energy changes from kinetic to chemical.
d. the energy changes from mechanical to kinetic.
write k for kinetic energy or p for potential energy.

1. a boy running down the street
2. a car sitting in the driveway

Explanation:

First Question (Rubber Gloves)

To solve this, we recall the properties of conductors and insulators. Conductors allow electric current to flow, while insulators prevent it. Rubber is an insulator, so rubber gloves protect by not conducting electricity. Option A (conductors) is wrong as they conduct, C (current stoppers) is incorrect terminology. So the correct answer is B.

Metals are good conductors of heat (and electricity). Insulators (A) don't conduct heat, and convection current (C) is a heat transfer method, not a material property. So metal is a conductor (B).

A flashlight uses a battery (chemical energy) which converts to electrical energy, then to light energy. Option A (chemical to mechanical) is wrong, B (kinetic to electrical) is wrong, C (sound to electrical) is wrong. So D is correct.

Answer:

B. insulators

Second Question (Metal in Car)