Name:______________________________ Section: _____________ Date: ____/____/______
20-7: How is Electricity Measured?
Pages 442-443
Objective:
 Use the correct units to measure voltage, current, and resistance.
Key Terms:
 Voltage: energy available to move charges through a circuit.
 Volt: Unit used to measure voltage.
 Ampere: unit used to measure electric current.
 Resistance: opposition to the flow of electric current.
 Ohm: unit used to measure resistance.
Voltage
→ Read this section.
→ Answer the following question. USE COMPLETE SENTENCES.
 EXPLAIN: What is voltage?
Current
→ Read this section.
→ Answer the following question. USE COMPLETE SENTENCES!
 IDENTIFY: What is an ampere a measure of?
Resistance
→ Read this section.
→ Answer the following question. USE COMPLETE SENTENCES.
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 DEFINE: What is resistance?
CHECKING CONCEPTS
1. Energy available to move charges through a circuit is called _____________.
2. Current is measured in __________________.
3. The unit for resistance is the _________________.
4. A long wire has __________________resistance than a short wire.
THINKING CRITICALLY ANSWER THE FOLLOWING QUESTIONS. USE COMPLETE
SENTENCES.
5. HYPOTHESIZE: Which has more resistance, a conductor or an insulator? Explain.
6. EXPLAIN: How is resistance useful in a toaster?
7. EXPLAIN: How could you measure the amount of electric current running through a circuit?
SCIENCE AND TECHNOLOGY: Superconductors
→ Read this section.
Page 2 of 3
→ Answer the following question. USE COMPLETE SENTENCES.
THINKING CRITICALLY: Why do you think finding materials that are superconductors at
room temperature can be useful?
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