Electronics Engineering

# How might ambient temperature may affect the resistance values you would measure in a circuit?

345 ###### 2011-09-13 12:07:46

Ambient temperature might affect the readings of the resistance value you would measure because the resistance of some materials changes with the temperature.

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## Related Questions  The thermistors are resistors whose resistance changes with the temperature. While for most of the metals the resistance increases with temperature, the thermistors respond negatively to the temperature and their resistance decreases with the increase in temperature. Since the resistance of thermistors is dependent on the temperature, they can be connected in the electrical circuit to measure the temperature of the body. A thermistor could be used to measure temperature, because its resistance is a function of its temperature. By the same reasoning, a thermistor could be used to temperature compensate a circuit. The best example of this is in the regulator, where the ambient temperature controls the charge voltage, because charge state in a battery is a function of temperature.  the thermistors respond negatively to the temperature and their resistance decreases with the increase in temperature. Since the resistance of thermistors is dependent on the temperature, they can be connected in the electrical circuit to measure the temperature of the body. Read more: http://www.brighthub.com/engineering/mechanical/articles/53511.aspx#ixzz1FeUDkOgw You measure the ambient temperature before the experiment in case the experiment is sensitive to ambient temperature. You want to record all of the environmental factors that might affect the experiment before starting it. You measure the ambient temperature after the experiment for the same reason, and also in case the experiment affected the ambient temperature. Depending on the experiment, environmental factors may need to be considered when analyzing the results. You have to measure the voltage, and the current. The resistance is then calculated by using Ohm's Law. a meter uses its own supply to measure resistance. you dont have to remove the resistor from the circuit but you must isolate it from the circuit supply to get an accurate reading. Scientists can use a electrical resistance thermometer, The resistance varies as a function of heat. If the resistance gets higher as temperature gets higher the resistance is said to have a positive temperature coefficient. If the resistance decreases as temperature increases, it is said to have a negative coefficient. The resistance thermometer in its simplest form is a series circuit containing a battery, thermal resistance, ammeter, and current limiting resistor. To measure the voltage drop in a circuit 1st we have to measure the each resistance, for which drop is occurring and than we have to measure current flowing through each resitance. After that we have to multiply current and resistance for each resistance which will ngive voltage drop in each resistance. Now to have total resistance we have to sum up all the voltage drops in whole circuit.  You use an "amp gauge" to measure amps in an actual circuit. It is hooked in series with the load. It can be placed anywhere in the circuit as long as it is hooked in series. Mathematically, you have to know the resistance, or wattage and voltage of a circuit. Volts=amps*resistance or amps=volts/resistance, or resistance=volts/amps. Ohms law! No, the circuit should not be energized when checking the resistance of a circuit. You connect a known voltage across the two points in the circuit, and measure the current that flows between the points. The ratio (voltage) / (current) is the resistance between those points. None. An RTD is a passive device. It changes resistance as the temp varies. Your circuit must basically measure the resistance to determine temp. There are many different types of RTD's, each with it's own temperature curve. Resistance can be changed by strain over time and changes in the temperature. Resistance thermometers are sensors that are used to measure temperature by correlating the resistance of the RTD elements. Set it to measure resistance. If the resistance is less than infinity, the circuit is continuous. A platinum thermometer changes the resistance of platinum with a change in temperature, thus by measuring the change in resistance we can measure the change in temperature. if not disconnected you will measure the resistance of the circuit in parallel with the resistor.  Most medical electronic thermometers are not calibrated to measure ambient temperatures. An ammeter has a finite resistance which is inserted in series with the rest of the circuit, increasing the total resistance and decreasing the current. A good ammeter has a very low resistance, so it shouldn't affect the circuit noticeably. Voltage is the electrical pressure in a circuitAmperes (amps) are the measure of electrical current in a circuitOhms are the measurements of resistance in a circuitCurrent is essentially how fast electrons are moving in a circuitResistance is what impedes the electrical current, and can be found in the wire or various loads in a circuitHope this helps! If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument. Resistance is the name given to something which opposes the flow of an electrical current in a circuit and an ohmmeter is used to measure it.The Ohm is the name of the unit used to measure resistance.Further noteThe most common type of instrument used to measure resistance is a multimeter, which includes an ohmmeter, an ammeter to measure the current flow in amps and a voltmeter to measure the potential difference in volts.

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