The Carbon composition resistors are a blend of carbon particles, graphite and ceramic dust mixed with a binder substance like clay. This mixture is treated with high pressure and temperature. After the whole thing is molded in a case, the leads are fixed.
· Thermal mass of the carbon composition resistor is higher so as to withstand high energy pulses.
· These resistors have low stability and high noise which is a disadvantage.
The following figure shows an image of carbon composition resistor.
Carbon composition resistors are used in Surge protection, Current limiting, and High voltage power supplies.