Question

1. a calculator uses a photovoltaic cell and a backup battery. which of the following types of energy does the calculator use?

i solar energy
ii chemical energy
iii kinetic energy
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

1. b.c. student ann makosinski designed a cup that can charge a cellphone when it is filled with a hot beverage. what type of energy does this invention most likely transform into electrical energy?

a. potential energy
b. thermal energy
c. mechanical energy
d. chemical energy

1. which of the following are components of a generator system?

i turbine
ii shaft
iii generator
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

1. which type of energy is transformed into electrical energy by a generator system?

a. potential energy
b. kinetic energy
c. rotational energy
d. mechanical energy

1. which of the following statements is true about energy?

a. it can be created.
b. it can be destroyed.
c. it can be transformed.
d. all of the above.

1. which of the following are used to generate electrical energy in british columbia?

i nuclear reactions
ii fossil fuels
iii river flow
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

Explanation:

Question 15

• The photovoltaic cell uses solar energy (I).
• The backup battery stores chemical energy (II).
• Kinetic energy (III) isn't used as the calculator doesn't rely on motion for energy, so only I and II apply.

Question 16

• The cup uses heat from the hot beverage. Thermal energy is heat energy, so the invention transforms thermal energy into electrical energy to charge the phone. Potential (A), mechanical (C), and chemical (D) don't fit the heat - based mechanism.

Question 17

• A generator system has a turbine (I) to capture energy, a shaft (II) to transfer mechanical energy, and a generator (III) to convert it to electrical energy. So all three (turbine, shaft, generator) are components.

Question 18

Answer:

A. I and II only