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Unformatted text preview: and1) (band2) x 10(band3) 18 EE1002 Introduction to Circuits and Systems Example resistor color bands: band1 – Brown (1) band2 – Black (0) band3 – Red (2) band4 – Gold (5%) R = 10x102 (5%)=10x100 =1000 Ohm (with 5% tolerance) Tolerance of 5% here means, the actual value of the resistor will be 1000x(1+0.05) i.e its value should be anywhere between 950 Ohm to 1050 Ohm. 19 EE1002 Introduction to Circuits and Systems Power in resistors Power is product of voltage and current. p vi With v iR , p i 2 R v
With i , p R
R Thus, power in resistor is always positive (energy is always absorbed by the resistor irrespective of the sign of current or voltage). This energy is either dissipated as heat or is converted to light as in an incandescent lamp. Each resistor will have a power rating, beyond which the resistor may get over heated and may get burnt. The commonly used resistors in most electronic circuits are rated as ¼ Watt. Open and Short Circuits A circuit element with resistance approaching zero is called a...
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This document was uploaded on 01/20/2014.
- Winter '14