To investigate a solar-powered motor, put a piece of masking tape on the shaft of the electric motor so it creates a tiny flag (see photo below). In the image below, we again show the connections on the back of the solar cell.
#Solarcell equations full
In our setup, the solar cell measured I sc = 0.48 amps in full sunlight (your results may vary). Like a wire, an ammeter has very low resistance, so will register a measurement similar to a short circuit. This is called the short-circuit current, or I sc. The maximum current that a solar cell can produce occurs when a wire is connected across the terminals. If that’s the case, you’ll need to move the input lead to that terminal.) (Note that there may be a separate terminal for measuring amperes. Then, use a black clip lead to connect the common (COM) terminal of the meter to the negative terminal of the solar cell. Use a red clip lead to connect the positive terminal of the meter to the positive terminal of the solar cell. In our setup, the reading of 0.16 volts shows what happens when almost no light reaches the collectors.įlip the solar cell face-up again so the light hits it directly, and set the meter to “DC amperes” on a scale that will measure a few amperes of electrical current. The solar cell measured for the setup shown below, for example, had a V oc = 1.2 volts in full sunlight.įlip over the solar cell (see photo below), and watch what happens to the meter reading. Tilt the solar cell in sunlight or lamplight and notice how the V oc changes. Since no current flows through a perfect voltmeter, a voltmeter measures the open circuit’s voltage. This is the voltage when no current is flowing through the cell. Measure the open circuit voltage ( V oc) across the solar cell. Then use the black clip lead to connect the common (COM) terminal of the meter to the negative terminal of the solar cell (see photos below). Using the red clip lead, connect the positive terminal of the meter to the positive terminal of the solar cell. Working outside, in a sunny place (or indoors, under a 100-watt incandescent bulb), set the multimeter to the DC voltage scale so it can measure a few volts.
0 kommentar(er)
