SamEnPingEd

=__**Battery Challenge Experiment**__=

**Description**
This is an experiment to test whether certain variables may affect the efficiency of a battery. Our 'battery' consists of two thin pieces of aluminum and copper in a beaker of salt water. According to our previous experiment, we can connect the two pieces of metal in order to create electricity. Our current experiment is to test whether altering the amount of salt water will change the efficiency of the battery.

Hypothesis
By adding more salt water in the beaker, we can expect the efficiency of the battery to increase because there will be more salt water to conduct the electricity.

Dependent Variable: Amount of salt water we have in the beaker. Independent Variables: The size of the metals, the water to salt ratio in the concentration, the temperature of the liquid.

Materials Used
Aluminum: 16.48 grams Copper: 51.03 grams Voltmeter and Wires 1000mL Beaker 100mL Graduated Cylinder Salt Water Concentration

Procedure
1) Get one piece of Copper and Aluminum, both about 10x4 cm. 2) Use the 100mL Graduated Cylinder to measure out 100mL of water. 3) Use the 25mL Graduated Cylinder to measure out 25mL of salt. 4) Mix them together using the 1000mL beaker. 5) Put the aluminum and copper pieces into the beaker so that they don't touch. 6) Connect each metal piece to a wire, and connect the wires to the voltmeter. 7) Record the observations.

We repeated this procedure five times, each time increasing the amount of water by 100mL and the amount of salt by 25mL.

Ratios
Approximate Weight of 25mL of Salt: 34.7 +/- 0.02 grams.
 * ~ Water (milliliters) ||~ Salt (milliliters) ||
 * = 100mL ||= 25mL ||
 * = 200mL ||= 50mL ||
 * = 300mL ||= 75mL ||
 * = 400mL ||= 100mL ||
 * = 500mL ||= 125mL ||

Observations
According to our observations, the voltage continued to steadily increase until we reached 500mL of water.
 * ~ Amount of Solution ||~ Voltage +/- 0.01 mV ||~ Amps +/- 0.2 mA ||
 * = 100mL ||= 0.490 mV ||= 3 --> decreasing ||
 * = 200mL ||= 0.530 mV ||= 5.2 --> decreasing ||
 * = 300mL ||= 0.545 mV ||= 18 --> decreasing ||
 * = 400mL ||= 0.548 mV ||= 19 --> decreasing ||
 * = 500mL ||= 0.520 mV ||= 20 --> decreasing ||

=Data=



These two graphs show that although the voltage increased as we added water, the change wasn't substantial.