Chapter 1: Energy and Power

Question 1

Energy

Answer 1

1) ability to do work

2) can be measured in food Calories (Cal), kilowatt-hours (kWh), and Joules (J)

Question 2

Hybrid automobile

Answer 2

1) 混合动力汽车

2）gasoline engines + batteries

Question 3

Fuel cells

Answer 3

1) produce electricity like batteries

2) are recharged by adding chemicals

Question 4

Power

Answer 4

1) rate of energy delivery
2) can be measured in Cal/sec or in Watts
3) power = energy/time

Question 5

horsepower / gigawatt

Answer 5

1) horsepower = 1 kW (human)

2) 1 GW = 1 billion watts (nuclear plant power)

Question 6

explosion

Answer 6

occurs when a great deal of stored energy is suddenly converted to heat in a confined space

Question 7

Kinetic energy can be measured in

Answer 7

calories

Question 8

mark the unit of energy or power
A. horsepower
B. kilowatt hour
C. watt
D. calorie

Answer 8

P
E
P
E

Question 9

least expensive for the same energy delivered

Answer 9

coal

Question 10

kinetic energy

Answer 10

moving energy, 1/2 mv*2

Question 11

Gravitational Potential Energy

Answer 11

energy stored in a gravitational potential, mgh

Question 12

radiation

Answer 12

energy in propagating oscillations of EM field

Question 13

heat

Answer 13

randomized kinetic energy of constituent particles

Question 14

acoustic

Answer 14

energy transmited through the compression and rarifaction of fluid

Question 15

Roughly how much power are you generating as heat in watts?

Answer 15

100