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Basic Electrical Measurements
Elliott
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The instruments that are of most use to the physicist and the electrical engineer are the voltmeter and ammeter. With these, we can directly measure: Potential Difference (or voltage) Current.
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Resistance (volts ÷ amps);
Basic Calculations We can then use the data to get: Resistance (volts ÷ amps); Power (volts × amps).
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The multimeter is often used, as it can measure voltage and current (but not at the same time).
Task: Use your Equipment to Create a circuit with a working component. Change the rheostat to three different values. Calculate the power and resistance for each. Present your results in a table.
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Circuit Diagrams You do not have to be an artist to draw a circuit diagram, but follow these simple rules: Use a pencil and a ruler; Draw the lines horizontally and vertically; Ensure that all the components are there, including the power supply; Use the correct symbols; Where there are junctions (wires joined together), there is a black circle, which represents a blob of solder.
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Draw The Following Diagrams
Two bulbs in, a variable resistor, a bank of three cells. 2. A bank of Two cells, a motor and a bulb in parallel and a fixed resistor. 3. One cell, a motor, buzzer and bulb in parallel, a voltmeter reading the potential difference of the bulb and an ammeter.
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Challenge You will each be given the following equipment:
A motor, a bank of cells, a voltmeter, an ammeter, thread, blue tack, a timer. Calculate the power of the motor.
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