Multisim demo 2.4 - 2.4(1 MULTISIM DEMO 2.4 THE WATTMETER...

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2.4(1) M ULTISIM D EMO 2.4: T HE W ATTMETER IN M ULTISIM The following demo shows how to utilize the wattmeter instrument. In the DC case, it will measure DC power dissipated. Later on in the AC case, it can be used to measure average power. Let’s first assemble the circuit which is shown in Figure 2.4.1 below. It consists of a 15 V DC supply and two resistors in series, the first of which is 10 k Ω and the second of which is 5 kΩ. Figure 2.4.1 Simple circuit consisting of two resistors in series and a voltage source. We’ll use a wattmeter to measure the power dissipated in each resistor. From a theory standpoint, we know that the two resistors can add together since they are in series to give us a simplified schema tic of a 15 kΩ attached to a 15 V DC source. Us ing our standard arsenal of equations, we therefore know that the current going through the circuit is: 3 3 10 1 10 15 15 R V I A = 1 mA We can then use this current to find the power dissipated in each resistor. For the 10 kΩ resistor: P 10k = I 2 · R 10k = (1×10 -3 ) 2 ·10×10 3 = 10.0 mW For the 5 kΩ resistor: P 5k = I 2 · R 5k = (1×10 -3 ) 2 ·5×10 3 = 5.0 mW The wattmeter can be accessed either through going up to the top menu bar and clicking on Simulate>Instruments>Wattmeter or clicking on the symbol on the instruments toolbar (if you have it open). Click and place one wattmeter next to each resistor The wattmeter is essentially a combined voltmeter and ammeter (current meter). It simply takes the values measured by both of the meters and determines the power.
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