1. Which of the following statements are true? (Select all applicable)
a. High conductivity of a wire means that it is more capable for handling currents
b. High resistivity of a wire means that it is more capable in handling current.
c. EMF or Electromotive force is the ideal voltage of a source.
d. Voltage is potential difference between two points while EMF is the ideal voltage
2. A household water heater has a resistance of 30 Ohm. The operating voltage is 220 V. Find the current passing through the resistive element in the water heater.
3. A household water heater has a resistance of 30 Ohm. The operating voltage is 220 V. Find the rate at which water is being heated
4. A light bulb has a 25 W rating, and it is plugged into a socket with terminals at a 220 V potential difference. Assuming that the current is steady at this voltage and power, find the current passing through the lightbulbs.
5. A light bulb has a 25 W rating, and it is plugged into a socket with terminals at a 220 V potential difference. Assuming that the current is steady at this voltage and power, find the resistance of the lightbulb.
6. Find the emf of the battery if the internal resistance of the battery is 1 Ohm.
7. A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80x10^-6 A. Compare the maximum possible voltage without shock across the thumb and index finger with a dry skin resistance of 4.0x10^5 Ohms and a wet skin resistance of 2000 Ohms. (show the rationalization)
8.1 If a current of 60.0 mA exist in a metal wire, how many electrons flow pass a given cross section of the wire in 10 minutes?
8.2 If a current of 60.0 mA exist in a metal wire, In what direction do the electrons travel with respect to the current?
a. opposite the conventional current
b. along the conventional current
c. electron flow is the same as the conventional current
9. In a 3.0 m length of a wire with a uniform radius of 0.40 cm, a potential difference of 10.0 V is found to produce a current of 0.40 A. What is the resistance of the wire?
10. In a 3.0 m length of a wire with a uniform radius of 0.40 cm, a potential difference of 10.0 V is found to produce a current of 0.40 A. What is the resistivity of the wire?
