| A | B |
|---|
| A steady current of 2.5 A flows in a wire for 4.0 minutes. How much charge passed through any point in the circuit? How many electrons would this be? | ??? |
| A small flashlight bulb draws 250 mA from its 1.5-V battery. What is the resistance of the bulb? If the voltage dropped to 1.2 V, how would the current change? | ??? |
| Calculate the resistance of a 40-W automobile headlight designed for 12 V. | ??? |
| An electric heater draws 15.0 A on a 120-V line. How much power does it use and how much does it cost per month (30 days) if it operates 3.0 h per day and the electric company charges 10.5 cents per kW-h? | ??? |
| A service station charges a battery using a current of 5.7 A for 7.0 h. How much charge passes through the battery? | ??? |
| What voltage will produce 0.25 A of current through a 3000-ohm resistor? | ??? |
| What is the resistance of a toaster if 110 V produces a current of 3.1 A? | ??? |
| A hair dryer draws 9.0 A when plugged into a 120-V line. (a) What is the resistance? (b) How much charge passes through it in 15 min? | ??? |
| If a 12-V battery pushes a current of 0.50 A through a resistor, what is its resistance, and how many joules of energy does the battery lose in a minute? | ??? |
| The element of an electric oven is designed to produce 3.3 kW of heat when connected to a 240-V source. What must be the resistance of the element? | ??? |
| What is the maximum power consumption of a 9.0-V portable cassette player that draws a maximum of 350 mA of current? | ??? |
| What is the maximum voltage that can be applied to a 2.7-kiloohm resistor rated at 1/4 watt? | ??? |
| At $0.110 per kW-h, what does it cost to leave a 40-W porch light on day and night for a year? | ??? |
| What is the total amount of energy stored in 12-V, 90 A-h car battery when it is fully charged? | ??? |
