I always end up making some mistake when doing these problems so I am worried. And I am not really interested in being this type of engineer, it's just a class I have to pass in my cs course.DaveE said:
And you think that motivates us to help you?Edy56 said:
It Is 5000. I forgot one 0 and then i wrote it so it's a lot less noticable but the problem is solved with 5000.Gordianus said:
No offense, but I am not interested in motivating anyone to help me. The replies would have been the same whether I was striving to be an engineer or not. The forum Is called homework Help, i posted because i needed Help, whether you want to help or not Is entirely up to you.phinds said:
I would help if I could read the question and the solution. I'm not going to waste time on GIGO.Edy56 said:
I posted two questions yesterday and they were minutes apart. On the first one you said there Is a Latex guide, on the second one you said "It's time you learn Latex"... Give me a break. You don't know someone's situation, what kind of computer or phone they have to demand the use of Latex and type such Long calculations when they Can just take a picture. Especially when I could still get a reply that engineers should check their work by themselves.Baluncore said:
You appear to have conflated other member's replies with my one reply.Edy56 said:
Okay sure, my mistake. But still, it's my third day on Here so give me a break about Latex. Not everyone Has time or resources to do it.Baluncore said:
Thank youuBabadag said:
A temperature-dependent resistor, also known as a thermistor, is a type of resistor whose resistance varies significantly with temperature. There are two main types: Negative Temperature Coefficient (NTC) thermistors, where resistance decreases with an increase in temperature, and Positive Temperature Coefficient (PTC) thermistors, where resistance increases with an increase in temperature.
The resistance of a thermistor at a given temperature can be calculated using the Steinhart-Hart equation for more accuracy or a simpler beta parameter equation for approximate values. The Steinhart-Hart equation is: 1/T = A + B*ln(R) + C*(ln(R))^3, where T is the temperature in Kelvin, R is the resistance, and A, B, and C are constants. The beta parameter equation is: R = R0 * exp[β * (1/T - 1/T0)], where R0 is the resistance at a reference temperature T0, and β is a material-specific constant.
The voltage across a thermistor in a circuit can be calculated using Ohm's Law, V = I * R, where V is the voltage, I is the current flowing through the thermistor, and R is the resistance of the thermistor at the given temperature. If the thermistor is part of a voltage divider, the voltage can be found using the voltage divider formula: V_out = V_in * (R_thermistor / (R_fixed + R_thermistor)), where V_in is the input voltage, R_thermistor is the resistance of the thermistor, and R_fixed is the resistance of the fixed resistor in the divider.
Several factors can affect the accuracy of temperature and voltage calculations for a thermistor, including the precision of the thermistor's resistance-temperature characteristics, the accuracy of the constants used in equations, the stability of the power supply, the quality of the connections in the circuit, and environmental factors such as ambient temperature and heat dissipation. Calibration and proper circuit design can help mitigate these factors.
Sure! Suppose we have an NTC thermistor with a resistance of 10kΩ at 25°C (298K) and a β value of 3950K. It is part of a voltage divider with a 10kΩ fixed resistor and a 5V supply. First, calculate the thermistor's resistance at a different temperature, say 50°C
