Electric Circuits (Part 3)

What You'll Learn

Energy can be transformed from one form to another but cannot be created or destroyed. A light bulb converts electrical energy into light and heat energy.

Key Words

kinetic
potential

Materials Needed

toy cars
ramps
string
weights

Safety First

Be careful with scissors — ask an adult for help if needed.
Do not look directly at the sun or bright lights.

Steps

Step 1 — Read

Read the introduction and identify the main idea of this lesson.

Step 2 — Do

Set up a pendulum with string and a washer. Change the string length and count swings per minute for each. Graph your results.

Step 3 — Observe

Compare the before and after states.

Step 4 — Record

Write your conclusion: did the results match your hypothesis? What would you change next time?

Check Your Understanding

Question 1

1 of 3

What is needed for a simple electric circuit?