How is heat dissipation related to a resistor?
The heat dissipation within a resistor is simply the power dissipated across that resistor since power represents energy per time put into a system. So the relevant equation is the equation for power in a circuit: P = I V = I 2 R = V 2 R, P = IV = I^2 R = frac {V^2} {R}, P = I V = I 2R = RV 2. . ,
How does the size of a resistor relate to its wattage rating?
All things being equal, the larger resister has a higher power rating. But all things are not equal. The composition of a resister determines how high of a temperature that it can tolerate. Thus, a smaller resistor that can tolerate high heat may have a higher wattage rating than a larger resister.
What’s the relationship between electric power and heat?
Power converted to heat in a component is always dissipated in an effective resistance in the component, so you can use P = I 2 R or V 2 /R to determine the power in watts from the current I through the resistance or the voltage V across it.
How is heat capacity related to the mass of an object?
It’s just the Specific Heat Capacity times the mass for a lump of a single subsatnce but, for an object with a mix of materials in it, it can be a useful parameter to use. Only if a component dissipates its power as heat, will it will get hotter.
How are heat sinks used in power resistors?
A simple, practical heat sink is an aluminum or steel plate as shown in Figure 1. When a resistor is attached directly to the heat sink, the heat generated by the resistor conducts to the metal plate, and then into the air as a result of convection.
How big is a standard radiator in feet?
radiators is 140 kW of heat at an inlet temperature of 95 °C. The basic radiator has a width of 0.5-0.6 m (20-23“), a height of 0.4-0.7 m (16-27”), and a depth of 0.025-0.038 m (1-1.5”).
What is the thermal resistance of a resistor?
A resistor is placed in the center of a 0.1 mm thick aluminum plate with an area of 10,000 mm 2 and an ambient temperature of 50°C. A power of 10 W is applied to the resistor. From Figure 2, the thermal resistance of the plate is about 7°C.