Problem
A. What is the difference between the law of conservation of energy versus energy conservation/energy efficiency? Very briefly describe each concept and give an example of each.
B. Explain the difference between potential and kinetic energy, and give an example of each.
C. A 9V battery is connected to a light bulb with a resistance of 200 ohm. What is the current in the circuit, in amps?
D. What is the value of the resistor of a circuit if it's connected to a 3V battery with a current flow of 0.06 amps?
E. How many watts of power would you need if you spent 6 seconds expending 1800 Joules of energy by trying to move a weight over your head?
F. A 2W light bulb is connected to a circuit using a 9V battery. What is the amperage of this scenario?
G. A 105W light bulb is connected to a power source with current flow of 0.875 amps. What is the rating, in volts, of that power source?
H. What do the textbook's authors say about human involvement related to climate change and the science behind it?
I. What are five key properties that renewable/green energy sources share and what two renewable energy sources hold the greatest promise and will have the greatest impact in the future?
J. What fossil fuel is significantly less impactful on the environment than coal? Name one environmental concern with its extraction.
K. Compare the direct costs to the consumer of using a succession of ten 100 W incandescent light bulbs with an efficiency to visible light of 5%, a lifetime of 1,000 h, and a price of 50 cents with one compact fluorescent lamp giving the same illumination at 22% efficiency, a lifetime of 10,000 h, and a price of $3. Assume a price of electricity of 10 cents per kWh.