Download 0002_hsm11a1_te_0501tr.indd

Name
5-2
Class
Date
Think About a Plan
Direct Variation
Electricity Ohm’s Law V= I  R relates the voltage, current, and resistance of a circuit.
V is the voltage measured in volts. I is the current measured in amperes. R is the
resistance measured in ohms.
a. Find the voltage of a circuit with a current of 24 amperes and a resistance of
2 ohms.
b. Find the resistance of a circuit with a current of 24 amperes and a voltage of
18 volts.
Understanding the Problem
1. Does Ohm’s Law represent a direct variation? Explain.
2.
If the formula is rearranged to solve for R or I, is it still a direct
variation? Explain.
Planning the Solution
3. For part (a), does Ohm’s Law need to be rearranged to answer the question?
Explain. If it does, how should the formula be rearranged?
4. For part (b), does Ohm’s Law need to be rearranged to answer the question?
Explain. If it does, how should the formula be rearranged?
Getting an Answer
5. For part (a), substitute the given values into the formula and simplify.
____________________________________________________________________________________
6. For part (b), substitute the given values into the formula and simplify.
____________________________________________________________________________________
Prentice Hall Algebra 1 • Teaching Resources
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
12