Energy and Power. Energy vs. Power What’s the difference?

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Presentation transcript:

Energy and Power

Energy vs. Power What’s the difference?

Definitions Energy is the ability to perform work. Energy is what allows us to do stuff. Power is the rate at which energy is transformed.

1 st Law of Thermodynamics Energy can never be created or destroyed So… since we can’t make it, we have to transform existing energy into the kind we need Can anyone name some common energy transformations?

Growing Plants Light Energy  Chemical Energy

Listening to an iPod Chemical Energy (from the battery)  Electrical Energy (in the iPod)  Sound Energy (from the speakers)

Hydroelectric Dam Gravitational Potential Energy  Motion Energy  Electrical Energy

Power So when we say we’re “using” energy or “generating” we’re really just changing it from one form into another Power is how fast we can (or need to) do that

Some Analogies… If power is the rate at which we’re moving … energy is how far we go.

If a Nike factory makes 1,000 shoes in an hour, how many shoes do we have after 8 hours?

In this example what is analogous to power? To energy?

Units! The International System of Units (SI) unit for power is the Watt 1,000 Watts is called 1 kilowatt There are many units for measuring energy, but we buy electricity from the utility in kilowatt-hours

Example: A 100-Watt Light Bulb A 100-Watt light bulb operates for 20 hours – How many Watt-hours of energy were transformed into light? – How many kilowatt-hours?

Home Energy Consumption Worksheet Look at the power required to operate each device Multiply the operating power by the number of hours of operation to find the energy consumed Multiply the hours of operation per day by 30 to find the energy consumed in a month Multiply the amount of energy consumed by the cost of energy [PROVIDE COST OF ELECTRICITY HERE]

Homework! Go home tonight and find three electrical devices Determine the amount of power needed to operate the device (some devices have the power rating written on them, otherwise you can use a Kill-A-Watt Meter or look it up on the internet) Estimate the number of hours you use the device per day Using [COST OF ELECTRICITY] per kilowatt- hour estimate how much the device costs in energy each month