Lab02_ResistiveCircuits

Lab02_ResistiveCircuits - MEASUREMENTS IN RESISTIVE...

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MEASUREMENTS IN RESISTIVE NETWORKS AND CIRCUIT LAWS LABORATORY The objective of this experiment is to provide working knowledge of the ammeter, voltmeter, and ohmmeter as well as their limitations in making measurements in resistive networks. In addition to the above, verification of Ohm's Law, Kirchhoff's Voltage and Current Laws, as well an introduction the potentiometer and current and voltage division will be presented. A voltmeter is used for measuring voltages. For the measurement of a voltage across a circuit component, a voltmeter must be connected in parallel with the component so that the voltage across the voltmeter is the same as that across the component. An oscilloscope is a special type of voltmeter. (The operation of an oscilloscope is presented in Laboratory 6.) ammeter is used for measuring currents. For the measurement of a current flowing through a circuit component, an ammeter is connected in series with the component so that the current flowing through the ammeter is the same as that flowing through the component. In other words, the branch must be disconnected, the ammeter inserted, and the branch reconnected. ohmmeter is used for measuring resistances of resistors. If a resistor is in a circuit, one end of the resistor must be disconnected from the circuit before a resistance measurement is made. Then, the ohmmeter leads are connected to the resistor terminals. Never connect an ohmmeter to an energized circuit because the reading will be incorrect. In measuring a voltage or a current, always start at a high range setting and work down to a suitable range. This safety precaution will prevent the meter from being destroyed by an unexpected high voltage or current. Also, when connecting a meter to a circuit, always consider the effect of the meter on the circuit.
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Lab02_ResistiveCircuits - MEASUREMENTS IN RESISTIVE...

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