EXPERIMENT 1

PART A Beginning at 0 V, increase power supply in so that the voltage across R3 is 1 V steps until 6 V. Measure and record the resulting current in Table 1.1 for each increment of voltage.

Break this connection to add ammeter

PART A Measure the actual value of each resistor and record in Table 1.1 Nominal Resistance R=6.8kΩ Measured Resistance R = (VR3) (V) 1 2 3 4 5 6 Current (Measured values) (mA)   (Theoretical values) 0.147 0.294 0.441 0.588 0.735 0.882 Nominal Resistance, R=1kΩ Measured Resistance, R = Nominal Resistance, R=1.5kΩ Measured Resistance, R =

Plot the graphs of I verses V for results in Table 1. 1 Plot the graphs of I verses V for results in Table 1.1. (Assign I to the vertical axis and V to the horizontal axis).

  Slope (G) R (1/G) Measured Values Theoretical Values  0.1471 mS   6.8 k

PART B Remove the voltmeter and ammeter connections Adjust the supply voltage (Vs) to 15V. (Note the value must be kept constant throughout the test by connecting voltmeter across the voltage supply in the circuit to observe the voltage.) Switch off the supply. Connect the ammeter in position A. Switch on the supply. Read the current through resistor R1. Current through R1 Connect the voltmeter across R1 and measure the voltage drop across it. Voltage across R1 Repeat 3 until 5 for the ammeter positions B, C, and D and the voltmeter positions across resistors R2 and R3. Record the voltage for close and open loop. Fill up the measured values in Table 1.3

Ammeter at position ‘A’

Supply voltage (volt) V1 (volts) V2 V3 Σ Voltage    1.613 2.4194   10.968 15  Supply current (mA) I1 I2 I3 I Total  1.613  1.613 mA  Total resistance (Ohms) R1 R2 R3 Σ R R1+R2+R3  1000  1500  6800  9300  

PART C A B C D Adjust the supply voltage 15V. (Note the value of the supply voltage and keep it constant throughout the test.) Switch off the supply. Connect the ammeter in position A, the total current, ITotal. Switch on the supply. Measure voltage across resistor R1 Place the ammeter at positions B, C, and D and the voltmeter positions across resistors R2 and R3. Be careful not to touch R3 during measurement as it might be hot. Fill up the measured values in Table 1.4.

A B C D

Ammeter at position ‘A’ Measure voltage across resistor R1 How ?

Ammeter at position ‘B’

Ammeter at position ‘C’

Ammeter at position ‘D’ +VS 1 k 1.5 k DMM as Ammeter x 6.8 k GND Ammeter at position ‘D’

Take note whether the current at position A is equivalent to Σ Current Supply current (ampere) I1 (amperes) I2 I3 Σ Current    15 mA  10 mA  2.206 mA  27.21 mA Supply voltage (volt) V1 (volts) V2 V3  15 15  15V  Equivalent resistance R1 (Ohms) R2 R3  1000  1500  6800  0.551 k Total conductance G1 (Siemens) G2 (siemens) G3 Σ G  1 mS 0.667 mS   0.147 mS 1.8149 mS  Take note whether the current at position A is equivalent to Σ Current