We now want to use Kirchoff's laws to solve for unknown currents in a circuit. We will go through the procedure step by step 6 V 1. Simplify the circuit (if possible). Are there any resistors that are clearly in parallel or series? If so, replace the resistors involved with the equivalent resistor and draw the simplified circuit. 20 2. Guess and draw the directions of currents. Guess the direction of each unique current in the circuit. Label and draw arrows in the circuit indicating the direction. In this case, there will be three unique currents so label them I, I2 and I3. If you guess the direction of a current wrong, the current will turn out negative which you can switch when you report your final answer. 10 V 24 V 3. Apply Kirchoff's Junction law for one of the junctions to get a relation between the unknowns I, l2 and I3. Pay attention to the direction of the currents.

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.