Electrical resistors can be made by forming a thin film of carbon on a layer of...

 

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Electrical resistors can be made by forming a thin film of carbon on a layer of an insulating material. A carbon film resistor is made from a film of width 7.0 mm and of thickness 3.0 jm. The diagram shows the direction of charge flow through the resistor 7.0 mm #H 3.0 μm resistor The resistance of the carbon film is 78 2. The resistivity of carbon is 4.1 x 10 m. (a) Calculate the length L. of the film. (b) The film must dissipate a power less than 1200 W from each square metre of its surface to avoid damage. Calculate the maximum allowable current for the resistor. charge flow (c) The current direction is now changed so that charge flows vertically through the film charge flow 4 Explain the change, if any, in the resistance of the carbon film. (2) (3) Electrical resistors can be made by forming a thin film of carbon on a layer of an insulating material. A carbon film resistor is made from a film of width 7.0 mm and of thickness 3.0 jm. The diagram shows the direction of charge flow through the resistor 7.0 mm #H 3.0 μm resistor The resistance of the carbon film is 78 2. The resistivity of carbon is 4.1 x 10 m. (a) Calculate the length L. of the film. (b) The film must dissipate a power less than 1200 W from each square metre of its surface to avoid damage. Calculate the maximum allowable current for the resistor. charge flow (c) The current direction is now changed so that charge flows vertically through the film charge flow 4 Explain the change, if any, in the resistance of the carbon film. (2) (3)

Answer rating: 100% (QA)

a To calculate the length of the carbon film resistor we can use the formula for resistance Resistan... View the full answer