... marked.Carbon resistors are common in Toyota electronic systems. Carbon is mixed with binder; the more carbon, the lower the resistance. Some have the resistance value stamped on, others are ... Spark plugs, themselves, have a carbon core to achieve the same results.SENSE OPERATING CONDITIONS Other components use resistance in sensing and monitoring operating conditions. The resistance ... Rheostats have two connections one to the fixed end of a resistor, one to a sliding contact on the resistor. Turning the control moves the sliding contact away from or toward the fixed end, increasing...