Download 13.3 Section Review and Problems File

NAME:____________________________________DATE:__________________PERIOD:______________
13.3 Section Review and Problems
(Section Review pg 311 #1-3)
1.
What happens to current if a circuit’s resistance increases? What if voltage increases instead?
2.
List the units used to measure resistance, voltage, and current. Give the abbreviation for each unit.
Units
Abbreviation
Resistance
Voltage
Current
3.
Classify as a conductor, semiconductor, or insulator for each of the following:
Classification
Air
Gold
Silicon
Rubber
Aluminum
Problems
4. What happens to the current in a circuit if the resistance doubles? What if resistance triples?
5.
What happens to the current in a circuit of the voltage doubles? What if it triples?
6. A hair dryer draws a current of 10 A when plugged into a 120V outlet. What is the resistance of
the hair dryer?
Looking for:
Solution:
Given:
Equation:
7. A television runs on 120 V and has a resistance of 60 ohms. What current does it draw?
Looking for:
Solution:
Given:
Equation:
NAME:____________________________________DATE:__________________PERIOD:______________
8. A digital camera uses one 6 V battery. The circuit that runs the flash and takes the pictures has a
resistance of 3 ohms. What is the current in the circuit?
Looking for:
Solution:
Given:
Equation:
9. The motor in a toy car has a resistance of 3 ohms and needs 1.5 amperes of current to run
properly.
 What battery voltage is needed?
Looking for:
Solution:
Given:
Equation:
 How many AA batteries would that car require?
10. Find the current in each of the circuits shown below.
11. Household circuits in the U.S. run on 120 V of electricity. Circuit breakers commonly break a
circuit of the current is greater than 15 amperes. What is the minimum amount of resistance
needed in a circuit to prevent the circuit breaker from activating?
Looking for:
Solution:
Given:
Equation:
12. A flashlight bulb has a resistance of approximately 6 ohms. It works in a flashlight with two C
batteries. How much current is in the flashlight’s circuit when the light bulb is lit?
Looking for:
Solution:
Given:
Equation: