Normal Size Small Size show me how
|Ratio of voltage to current flowing through it
|What is the unit of resistance?
|What is an ohmic conductor?
|A conductor whose resistance changes with voltage
|What is a practical resistor?
|A resistor of a specific value
|What is another name for a variable resistor?
|What is the total resistance of a set of resistors in series?
|Name four factors that affect resistance.
|Temperature. Length. Cross sectional area. Material of the conductor.
|What is the effect of increasing the temperature of a metallic conductor?
|Resistance increases (linearly)
|What is the effect of increasing the temperature of a semi-conductor?
|What is a thermistor?
|A semi-conductor whose resistance decreases rapidly with an increase in temperature
|What is resistivity?
|The ratio of resistance by cross sectional area to length
|What is a wheatstone bridge?
|A setup used to determine the resistance of a conductor using three resistors of known resistance
|Two uses of a wheatstone bridge.
|Temperature control, fail safes