Electricity and Magnetism — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A battrey gives energy to make a bulb light up.
Corrected: A battery gives energy to make a bulb light up.
The correct spelling is battery, which stores electrical energy for a circuit.
2. Fix the sentence:
Electricity flows threw wires to the bulb.
Corrected: Electricity flows through wires to the bulb.
Through means passing along a path; threw is the past tense of throw.
3. Fix the sentence:
A circuit must be open for the bulb lights up.
Corrected: A circuit must be closed for the bulb to light up.
A closed circuit lets electricity flow in a complete loop so the bulb can light.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A battery stores energy that can flow through a circuit.
A battery is the energy source for a simple Grade 3 circuit.
2. Electricity travels along a thin metal wire to the bulb.
Wires carry electricity between parts of a circuit.
3. A light bulb glows when electricity flows through it.
A bulb turns electrical energy into light and heat energy.
4. A circuit is a closed path that electricity can flow around.
A complete circuit is needed for electricity to reach the bulb.
Part C: True or False?
Read each statement. Circle True or False.
1. A bulb can light up without a battery or power source.
True False
A bulb needs a power source like a battery to provide energy.
2. Wires carry electricity from the battery to the bulb.
True False
Wires connect the parts of a circuit so electricity can flow.
3. A circuit with a broken wire will still light the bulb.
True False
A broken wire creates a gap so electricity cannot flow to the bulb.