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Transcript
Name:________________________________ HC209 Lab #3: Toasterville Hydroelectric dams convert gravitational potential energy (falling water) into electrical energy (turbines). This experiment consists of a pulley attached to a small generator. A dropping mass, attached to the string, will turn the wheel and generate electricity (lighting the bulbs, i.e. toasters in your little town). An annmeter and a voltmeter are attached to the circuit so you can measure the current generated by the mass and the voltage across the bulb. Attach the mass to the string and let it drop without the electrical leads attached to the bulb. Time how fast the mass falls with the stopwatch. Now attach the electrical leads for a 2nd and 3rd blubs and repeat. Trial # 1 bulb Average: Does the mass fall faster or slower? Why? 2 bulbs 3 blubs An ammeter and voltage meter are attached to the power system. With one mass attached to the string measure the current, voltage and the time it takes for the mass to fall. Record this information below for three trials. (note the meters are designed to measure the maximum values and need to be reset after every trial). Take the average of the three trials and record at the bottom of the table. trial # volts (V) current (C) power (P=VxC) time (secs) Energy (E=Pxt) average: The energy generated by the system is power times time (E=Pxt). Determine the average energy produced. Repeat the above experiment with two masses attached to the string. trial # volts (V) current (C) power (P=VxC) time (secs) Energy (E=Pxt) average: Determine the average energy produced. Toasterville's population doubles (represented by adding one more light bulb). How many masses (dams) are needed to return the current and voltage levels to the first experiment? What does this mean for the fish?