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If the current increases what happens to resistance?
An increase in current will only affect resistance if it causes the temperature of the conductor to change. For pure metallic conductors, and increase in temperature will cause an increase in resistance.
How are currents calculated?
Ohm's Law says I = V/R. You need to know the voltage across the component and its resistance, for that particular temperature and time, in order to calculate the current in the component at that instance.
What will be Heat developed in current carrying carrying conductor?
Any conductor has resistance. Maybe not much, but there's always some.Any resistance dissipates power, at the rate of I2R. (I = current through it, R = its resistance.)That's how you build toasters.
Why you need resistance in series with led?
limit current and avoid having it explode
Four 50 ohms are connected in series calculate the current in the circuit?
The series resistance is 4 x 50 = 200 Ohms. You would need additional information to get the current; usually this is calculated from the voltage. current = voltage / resistance.The series resistance is 4 x 50 = 200 Ohms. You would need additional information to get the current; usually this is calculated from the voltage. current = voltage / resistance.The series resistance is 4 x 50 = 200 Ohms. You would need additional information to get the current; usually this is calculated from the voltage. current = voltage / resistance.The series resistance is 4 x 50 = 200 Ohms. You would need additional information to get the current; usually this is calculated from the voltage. current = voltage / resistance.
If the current increases what happens to resistance?
An increase in current will only affect resistance if it causes the temperature of the conductor to change. For pure metallic conductors, and increase in temperature will cause an increase in resistance.
Suppose a wire whose resistance is 2.5and 1.0 Amp of current for 1 second raises its temperature by 100 C What is the amount of current required to raise the temperature 100 C in 0.5 seconds?
resistance is 2.5 has no meaning. You need to include units!
What is the difference between thermocouple and RTD?
A thermocouple measures temperature difference between two points, producing a tiny voltage corresponding to the difference in temperature. To measure temperature with a thermocouple, you need to know the temperature of one junction and calculate the difference from the table or equation for the type of t/c used. An RTD changes resistance in response to temperature--to measure temperature with an RTD you measure its resistance (usually by putting a known voltage across it and measuring the current).
Investigate the relationship between the size of the electric current passing through a length of wire and its heating effect?
The relationship between size of current in a wire and its heating effect is very simple :- Heating is proportional to the square of the current. The actual heating depends also on the resistance of the wire. W=I2R ( I is current in Amps, R is resistance in Ohms , W is heat output in Watts. ) (Note: The Watt is strictly unit of power. That is to say the rate that energy is transfered or used at. The Joule is a unit of energy equivalent to roughly the amount of mechanical work done when a 1kg mass is lifted 9.8cm. The Watt is the number of Joules expended per second.) For AC current this relationship gives an instantaneous value for the power. To get the average power you need to use the RMS value. (Peak value divided by the square root of two.) The above relationship holds true for all cases, but the wires resistance will change with temperature. In practice this means the equation must be applied for the wire in thermal equilibrium with it's environment. IE when the rate of heat output equals the rate of energy input. That is, it's working temperature. The way a material changes resistance with temperature can be quite complex and depends on the material, but for metals the resistance increases linearly with temperature. How much is given by the temperature coefficient of electrical resistance for the particular metal. This gives the amount that the resistance changes proportional to the change in temperature as a fraction of the original resistance.AnswerIt's work, not heat, that's proportional to the square of the current passing through a resistance. The amount of heat depends on the temperature difference between the resistance and the surrounding atmosphere.
Does temperature effect a disposable camera?
Yes, you will need to keep it above freezing and below 100 degrees F.
How long does pottery need in the kiln?
There is really no set time on how long pottery need in the kiln. You just it to be at a certain temperature to get the effect like having it on low temperature to melt your glaze and some has to be on high to melt.
Will you need sunglasses on mercury?
Yes - very thick ones! You would also need an oxygen tank, a pressure suit a life support system - made with materials that are high in temperature resistance.
Why do you need thermal resistors?
these are used in control circuits , where a temperature - sensing application, is required to detect changes in temperature ; the resulting change of resistance value in the resistor itself will reflect the temperature change . thus a small change in temperature can be detected . an application is within sensetive instrument systems which require a sensetive temperature detection - method .
How many watts does 100 ohms equal?
Need the voltage or current of the circuit. And the type of lamp (bulb)--is it incandescent, fluorescent, LED, discharge? Also need to know the temperature--the resistance of a tungsten filament changes by a very large amount from ambient temperature to hot/operating temperature.
Why do you need a clock for studying?
it saves time
Why does resistance need a leader?
the resistance needs a leader because its a serious operation
What must be held constant when testing the effect enzyme concentration on enzyme activity?
temperature,pH and substrate concentration
