Experiment #1 1. Electric power has the standard unit of Watt, which equals to t

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Experiment #1
1. Electric power has the standard unit of Watt, which equals to t

Experiment #1
1. Electric power has the standard unit of Watt, which equals to the product of current (in Ampere) and voltage (in volt). Find a cellphone charger and write down the input power (in AC) and output power (in DC). What percentage of the input power is converted to output power (and used to charge your cellphone)? This percentage is known as your phone charger’s ‘conversion efficiency’.
My cellphone charger: ______________ brand name.
1. Input Power = ___________ watts
2. Output Power = _____________ watts.
3. Conversion Efficiency = ___________%

2. Rechargeable battery stores energy, and energy is measured in Joules. Take out your laptop computer’s battery pack (this is the first thing you need to do if your laptop suffers a water damage) and find out its capacity.
My laptop computer’s battery has a capacity written as ____________. In standard unit, that is ____________ joules.

3. Design a procedure to find out your automobile’s fuel efficiency. Describe what number (and from where) you need to collect in order to compute your car’s fuel efficiency. Express the efficiency both in miles per gallon and liter per kilometer.
Procedure to determine my car’s fuel efficiency:
1.
2.
3.

Use the numbers above, the fuel efficiency can be calculated:
(show your calculation)

Fuel efficiency: ________ miles per gallon
Fuel efficiency: ________ liter per kilometer

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