Experiment 1
Kirchoff's Current and Voltage Laws Objective: <
To study the relation between current and voltage in DC circuits, and to observe resistance, current, and voltage relationships in series and parallel combinations.
Equipment: < < < < <
Digital multimeters, 2 DC power supply, IP18, 0-15 V, 2 Resistors, 100 S, 1000 S, 2200 S, 3300 S, 4700 S Bread boards Bread board leads
Physical Principles: Ohm's Law For many materials the current resulting when a voltage is applied is directly proportional to the voltage. The proportionality constant is defined by R
V I
(1)
where R is called the resistance and is measured in ohms. Resistors in Series The effective resistance of the three resistors in figure 1 connected in series is equal to the sum of the resistances of each resistor. Req R1 R2 R3
Resistors in Parallel
(2)
Figure 1 Resistors in series.