If you understand and can do these problems you should do well on the quiz.
1. What are the resistance formulas (re-arrange and solve for all variables):
Electrical resistance
Wire Resistance
Series resistance
Parallel resistance
2. What does each color band represent on four band resistors:
3. A series circuit with a 24 V battery operates a space heater that has 2.62 A of current flowing through it. Find the resistance of the heater.
4. A 625-ohm and a 3334-ohm resistor are connected in parallel to a 120 V source. Find the total resistance (Rtot) of the circuit.
5. A current of 4.15 A has 625.13 ohms of resistance. What is the voltage?
6. Calculate the resistance (in ohms) of a 2.52 meter long piece of copper wire which has a diameter of 0.37 centimeters.
7. What is the length of a piece of aluminum wire, if it has a resistance of 345.67-ohms and a diameter of 0.045 centimeters?
8. A 55-ohm resistor and a 8900-ohm resistor are connected in series with a 12 V battery. Find:
a. the total resistance (Rtot) of the circuit
b. the amount of current (I) through the circuit
c. the voltage difference across the 55-ohm resistor
d. the voltage difference across the 8900-ohm resistor
9. How much resistance must you add to a 12 volt series circuit if you need to limit the current across the 2.25 volt load to 1.5 amps?