Download Fill in the correct symbol and units for the following: Symbol Units

1. Fill in the correct symbol and units for the following:
Symbol
Units
Current
Resistance
Power
Potential Difference
2. If you were using a 9 volt battery to operate a radio and the resistance was 100 ohms, what would the current be?
3. The energy supplied to US home is 110 volts. If the current running through your toaster at home is 5 amps, what
is the toasters resistance?
4. The current running through a neon light is 45 amps. If the resistance is 5 ohms, what is the voltage?
5. Mr. Hermann invented an “Automatic Brain Study Aide” which implants into the cerebrum of people and
improves their intelligence. It needs a current of 2,000 amps. If the resistance is 82.5 , what is the voltage
required?
6. As the number of resistors in a series circuit increases, the overall resistance __________ (increases, decreases,
remains the same) and the current in the circuit __________ (increases, decreases, remains the same).
7. Use your understanding of equivalent resistance to complete the following statements:
a. Two 3 resistors placed in series would provide a resistance that is equivalent to one _____ resistor.
b. Three resistors with resistance values of 2, 4 , and 6 are placed in series. These would provide a
resistance that is equivalent to one _____ resistor.
c. Three resistors with resistance values of 5 , 6 , and 7 are placed in series. These would provide a
resistance that is equivalent to one _____ resistor.
8. Three identical light bulbs are connected to a D-cell as shown at the right. Which one of the following statements
is true?
a. All three bulbs will have the same brightness.
b. The bulb between X and Y will be the brightest.
c. The bulb between Y and Z will be the brightest.
d. The bulb between Z and the battery will be the brightest.
9. Three identical light bulbs are connected to a battery as shown at the right. Which adjustments could be made to
the circuit that would increase the current being measured at X? List all that apply.
a. Increase the resistance of one of the bulbs.
b. Increase the resistance of two of the bulbs.
c. Decrease the resistance of two of the bulbs.
d. Increase the voltage of the battery.
e. Decrease the voltage of the battery.
f. Remove one of the bulbs.
10. Three resistors are connected in series. If placed in a circuit with a 12-volt power supply. Determine the
equivalent resistance, the total circuit current, and the voltage drop across and current at each resistor.
11. As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit
____________ (increases, decreases) and the total current of the circuit ____________ (increases, decreases).
12. Use your understanding of equivalent resistance to complete the following statements:
a. Two 6  resistors placed in parallel would provide a resistance that is equivalent to one _____ resistor.
b. Three 6 resistors placed in parallel would provide a resistance that is equivalent to one _____ resistor.
c. Three resistors with resistance values of 2 , 4 , and 6  are placed in parallel. These would provide a
resistance that is equivalent to one _____ resistor.
13. Three identical light bulbs are connected to a D-cell as shown below. P, Q, X, Y and Z represent locations along
the circuit. Which of the following statements are true?
a. The current at Y is greater than the current at Q.
b. The current at Y is greater than the current at P.
c. The current at Y is greater than the current at Z.
d. The current at P is greater than the current at Q.
e. The current at Q is greater than the current at P.
f. The current is the same at all locations.
14. Three resistors are connected in parallel. If placed in a circuit with a 12-volt power supply. Determine the
equivalent resistance, the total circuit current, and the voltage drop across and current in each resistor.