1. Reconnect the three resistors in parallel.
Now, follow the diagram as shown in figure 3, and connect the three resistors to the power
supply. Arrows show direction of current flow. Set the power supply to 5V and measure the
voltage drop across each resistor, the total voltage drop across the positive and negative sides of
the circuit, the current in the circuit and the current through each resistor. Write down your
You will need to change the voltmeter and ammeter connections accordingly to make all these
measurements. When measuring the voltage across a resistor while also measuring current,
connect the voltmeter only across the resistor, not across the resistor and ammeter.
2. Calculate the current for each resistor and enter it in your data table. Calculate the total current
of the three resistors by adding your measured values (IP = I1 + I2 + I3 + ...). Calculate the
predicted current (I*) by substituting your measured values for the voltages and resistances of
each resistor into the formula I*=V/R.
Table 1: Measurements of Resistors
Formula of eq.
Table 2: Vs,V1, &V2 as shown in figure 2 in the lab manual:
Table 3: Vs,V1, &V2 as shown in figure 5 in the lab manual:
Table 4: Is,I1, &I2 as shown in figure 6 in the lab manual:
Table 5: Current and Voltage measurements of figure 3:
Source Voltage Vs