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Block __________
minutes spent on DH:_________
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First name ________________________________________
Freshman Physics Honors with Dr. Leopold
DH42 – Voltage, Resistance and Ohm’s Law (Goes with day 62. Self-grade out of 23.)
1. The source in an electric circuit performs two functions. What are they?
2. Fill in the table below.
name of
symbol
quantity
SI unit
If the unit is short for some combination of other
units, show that in this column.
charge
current
resistance
voltage
3. The SI unit called the volt is short for joules per _______________________.
4. Suppose you are using a 1.5 V battery as your source in an electric circuit. How much energy does an
electron pick up as it goes through the source one time? Show your calculation.
5. A 9.00-V battery will give __________________________J of energy to each electron that passes
through it. (Calculation required – use space below.)
6. Suppose enough electrons pass through a 1.5 V battery that the total charge passing through the battery
is 1.00 coulomb. How much energy (total) did the source give to those electrons?
7. What do you have to do to a generator to increase the voltage it supplies to your circuit?
8. The electrical energy given to an electron as it passes through the source is
__________________________ the electrical energy taken from an electron as it passes through the load.
9. In an electric circuit, the voltage of the source is __________________________ the absolute value of
the voltage of the load.
10. When you increase the source voltage in a circuit the ___________________ in the circuit increases
in response.
11. The only circuit element you can use for a load that has an I vs. V graph that is a straight line through
(0,0) is a ______________________________.
12. A 450 ohm resistor resists current _________________ than a 100 ohm resistor.
13. Consider an I vs. V graph for a resistor. Find the units of the slope of the line. Show your work.
14. In a closed circuit, does more current come out of one side of a battery than goes in the other side?
Explain your answer.
TRUE OR FALSE?
15. Current and voltage mean the same thing.
16. In a circuit with a battery and a light bulb, the battery sends electrons to the light bulb, and the
light bulb uses up the electrons to create heat and light.
17. Current gets used up in a circuit.
18. A 1.5 V battery is connected to a 45.0 ohm resistor. Find the current in the circuit. Show your
work.
19. A 45 ohm resistor is connected to a generator and 1.20 A of current flow in the circuit. What
must the source voltage of the generator be? Show your work.