Black is answers

1. A motor is connected to a 12V battery and 1.5A flow through the motor. How much power is delivered to the motor? How much energy is converted if the motor runs for 15 minutes? 18W, 1.62x10'J 2. For the circuit on the right... a) What should the ammeter reading be? 1.5A b) What should the voltmeter reading be? 27V c) How much power is delivered to the resistor? 40.5W 27V 180 d) How much energy is delivered to the resistor per hour? 1.46x10'J 3. A lamp draws a 66mA (milliamp) current when connected to a 6V battery. When a 9V battery is used, the lamp draws 75mA. a) Does the lamp obey Ohm's Law? Maybe? b) How much power does the lamp dissipate when it is connected to the 6V battery? 0.396W c) How much power does it dissipate at 9V? 0.675W 4. An incandescent light bulb with a resistance of 10$2 when it is not lit and a resistance of 40$2 when it is lit has 120V placed across it. a) What is the current while the bulb is lit? 3A b) What is the current the moment the bulb is initially lit? 12A c) When does the bulb use the most power? 5. You connect an 1802 hairdryer to a 120V source. You use the hairdryer 10 minutes a day. If energy costs $0.12 per k W-hr, how much does it cost to use the hairdryer for 2 weeks? $0.224 6. An iPhone uses 5V and 1A to charge. On average, you charge you phone for 2.5 hours a day. If energy costs $0.12 per k W-hr, how much does it cost to charge your iPhone during the month of March? 4.65 cents