Use your index finger to touch the IC 7812 body, can you feel the heat that is being
dissipated from the IC ? Move your index finger to touch the load resistor body, can you feel
the heat that is being dissipated from the load ? Can you estimate the body temperature of
both devices ?
It is common to connect an LED to display output status of the DC power supply. A
series resistor is selected to limit current to appropriate value. In this experiment connect a
1 kΩ 1/4W resistor as shown in Figure 5. Use a multi-meter to measure voltage across the
resistor and calculate for the LED current.