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Mrs. Zimmer
Conceptual Physics 3
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Hour:______
Date started: __________
Date completed: ___________
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Current Electricity Tutorial
Part 3
(2 Days)
Directions: Go to www.google.com. Search for “Physics Classroom”. Click on “Physics Classroom
Table of Contents”. Click on “Current Electricity” that is on the left. Go through both topics found under
“lesson 3 Electric Current” and answer the following questions in detail.
1. What is the charge carrier in the wires of electrical circuits?
2. Describe the path an electron takes.
3. What discourages the flow of charge?
4. Define load.
5. The total loss of __________ ___________ of a single charge as it passes through the
external circuit is ________ to the gain in electric potential which it experiences in the battery.
6. Each light bulb results in what for the charge?
7. This loss in electric potential corresponds to what?
8. Define resistance.
9. List the 3 variables that affect the total amount of resistance to charge flow within a wire of an
electric circuit.
10. Describe what resistivity is dependant on.
11. What can be measured and expressed mathematically?
12. What is the metric unit for resistance?
13. Write the equation for resistance and label what each variable stands for.
14. Describe Ohm’s Law in words and equation.
15.
How can you rearrange Ohm’s law to find current?
16. This equation indicates the ___________ variables which would affect the amount of
__________ in a circuit.
17. The _____________the battery voltage (i.e., electric potential difference), the
______________ the current. And the _____________ the resistance, the ________ the current.
18. When does charge flow at the greatest rate?
19. The diagram below depicts a couple of circuits containing a voltage source (battery pack), a resistor
(light bulb) and an ammeter (for measuring current). In which circuit does the light bulb have the greatest
resistance?
20. You have likely been warned to avoid contact with electrical appliances or even electrical outlets
when your hands are wet. Such contact is more dangerous when your hands are wet (vs. dry) because wet
hands cause ____.
a. the voltage of the circuit to be higher
b. the voltage of the circuit to be lower
c. your resistance to be higher
d. your resistance to be lower
e. the current through you to be lower
21. If the voltage across a circuit is quadrupled, then the current through the circuit would be ____.
a. one-fourth as much
b. four times as much
c. unchanged
d. ... nonsense! There would be no way to make such a prediction.
22. Use the Ohm's law equation to provide numerical answers to the following questions:
a. An electrical device with a resistance of 3.0 will allow a current of 4.0 amps to flow through it if a
voltage drop of ________ Volts is impressed across the device.
b. When a voltage of 120 V is impressed across an electric heater, a current of 10.0 amps will flow
through the heater if the resistance is ________ .
c. A flashlight that is powered by 3 Volts and uses a bulb with a resistance of 60 will have a current of
________ Amps.
23. Use the Ohm's law equation to determine the missing values in the following circuits.