quiz 1 Essay

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kWh is a unit of power.

Correct B ) FALSE

kWh is the amount of energy from the steady production or consumption of one kilowatt of power for a period of one hour.

One calorie is defined as the amount of energy that is required to raise the temperature of _______________.

Correct B ) 1 g of water through 1°C

calorie is a unit of energy. 1 calorie is the amount of energy required to raise the temperature of 1 g of water through 1°C

If Peter expends 2,000 calories running a mile in one hour and Samantha burns 1000 calories riding a bike in thirty minutes. Who spent the greatest amount of energy during their exercise?

Correct C ) Peter

Peter: Energy expended = 2000 cal
Samantha: Energy expended = 1000 cal

Energy in Uranium is stored as _____ energy.

Correct A ) Nuclear

Uranium is a radio active material. Energy in Uranium is stored as nuclear energy.

A BTU has more energy than a calorie.

Correct A ) TRUE

A BTU is the amount of heat required to heat 1 lb (454 grams) of water through 1°F. Whereas 1 calorie is the amount of heat required to raise 1 g of water through 1°C. Therefore there is more energy in one BTU.

A room air conditioner used by Joel is rated at 577 watts. Joel used the air conditioner for 8 hours every week during summer. Calculate the total energy consumed by the air conditioner (in kWh) during the summer semester which runs for 8 weeks?

Correct A ) 36.9

Energy Consumption = 577 / 1000 x 8 x 8 = 36.92 kWh

The energy in fossil fuels such as petroleum is stored as _____ energy.

Correct C ) Chemical

In fossil fuels, energy is stored in bond as chemical energy

One kilo calorie is equal to how many calories?

Correct D ) 1000

1 kilocalorie = 1000 calories

What is the form of energy in biomass?

Correct C ) Chemical

Energy is stored in biomass in the form of chemical energy

If Peter expends 1,500 calories running a mile in one hour and Samantha burns 1,500 calories riding a bike in forty-five minutes. Which one of the two spent the greatest amount of energy?

Correct B ) They are the same

Peter: Energy expended = 1500 cal
Samantha: Energy expended = 1500 cal

From the following, identify the group where all energy sources are renewable energy sources.

Correct D ) Solar, Nuclear Fusion

Solar, Nuclear Fusion, Biomass, Wind, Tidal are renewable energy sources
Nuclear Fission, Petroleum, Coal are non-renewable energy sources.

Food calorie (Cal) is a unit of _________.

Correct A ) Energy

A food calorie (cal) is equal to one kilocalorie. The food calorie is often used when measuring the energy content of food.

One food calorie is equal to how many calories?

Correct C ) 1000

1 food calorie = 1000 calories

Jane uses a water heater that is rated at 3024 watts for 4.4 hours everyday. The cost of electricity in her region is 11.7 cents per kWh. Calculate the annual operating cost for the water heater in dollars.

Correct A ) 568.22

Annual Energy Consumption = 3024 / 1000 x 4.4 x 365 = 4856.54kWh
Annual Operating Cost = 4856.54 x 11.7 / 100 = $568.21

Solar radiation can be used to generate electricity.

Correct A ) TRUE

Renewable and non renewable energy sources can be converted to electricity and heat.

One BTU of energy is enough to do what?

Correct B ) Heat one pound of water by one degree Fahrenheit.

A BTU is the amount of energy that is required to heat 1 lb of water by 1°F.

An old refrigerator which is rated at 304 Watts and runs for 11 hours everyday is replaced by a new energy efficient refrigerator which is rated at 234 Watts and is expected to run 8 hours everyday. If electricity costs 14 cents per kWh, what are the energy savings in the month of
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