Fig. 2. Circuit for PRELAB 1.1. Fig. 3. Circuit for PRELAB 1.2. Redraw Figure 2
ID: 1929749 • Letter: F
Question
Fig. 2. Circuit for PRELAB 1.1. Fig. 3. Circuit for PRELAB 1.2. Redraw Figure 2 to show an ideal ammeter measuring the current in each resistor. Label the ammeter readings for Vs = 8.0 V, R1 = 220 Ohm, R2 = 450 Ohm, R3 = 300 Ohm. Label the voltage across each resistor. Compute the theoretical value of the current, I, for the circuit of Figure 3. Insert a real ammeter (resistance of 100 Ohm) to measure the current in the 1000 Ohm resistor. Draw the circuit. Compute the current that flows in the 1000 Ohm resistor in this circuit. Add an identical ammeter in series. Draw the circuit. Compute each ammeter reading.Explanation / Answer
1.1) a)R1 and R2 are parallel. Equivalent resistance is 147.76 ohms toral resistance in circuit is 147.76 + 220 = 367.76 ohms current, I = V/R = 8/367.76 = 21.2milliamp Ammeter reading at resistance R1= 21.2 mA Ammeter reading at resistance R2= 6.93 mA Ammeter reading at parallel resistance R1 =14.27 mA b) Voltage across R1 = 21.12*220 = 4.646 Voltage across parallel R1 and R2 = 3.364 1.2)a) when 100 ohms resistance is connected in parallel , voltage across 1000ohm resistance is given by 10*(100/1100)= 0.909amp b) when identical ammeter is added in series then series ammeter reading = 10*100/1200 = 0.833amp parallel ammeter reading = 10*1100/1200 = 9.16667amp
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