PART A

Question

According to the law of conservation of energy, energy is not created or destroyed. It changes form or is transformed. What energy transformation(s) is/are depicted here?
Responses
A electrical energy ⇒ light energyelectrical energy ⇒ light energy
B potential energy ⇒ kinetic energy ⇒ light energypotential energy ⇒ kinetic energy ⇒ light energy
C chemical energy ⇒ electrical energy ⇒ light energychemical energy ⇒ electrical energy ⇒ light energy
D chemical energy ⇒ electrical energy ⇒ heat and light energychemical energy ⇒ electrical energy ⇒ heat and light energy
Question 2

PART B
Electrical energy is used to turn the blades of a fan. The amount of energy transformed is seen here: 750 J electrical energy is transformed into 400 J kinetic or mechanical energy. What happened to the remaining 350 J of energy?
Responses
A It was lost due to friction.It was lost due to friction.
B It was transformed into 350 J of heat energy.It was transformed into 350 J of heat energy.
C It was destroyed by the rotating blades of the fan.It was destroyed by the rotating blades of the fan.
D It was never used and therefore was not transformed.

Answer 1

PART A: The correct response is C: chemical energy ⇒ electrical energy ⇒ light energy.

This option depicts a transformation where chemical energy (such as from batteries or fuel) is converted into electrical energy, which is then transformed into light energy (for example, in a light bulb).

PART B: The correct response is B: It was transformed into 350 J of heat energy.

In energy transformations, not all energy is converted into useful work (in this case, kinetic energy). The lost energy usually transforms into heat due to resistive forces and inefficiencies, such as friction. Thus, the remaining 350 J would manifest as heat energy, consistent with the law of conservation of energy.