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The main power producers in an electrical system are the battery and alternator. The alternator puts 14 volts of alternating current into the electrical system and resistors. The resistors only allow a fraction of the AC voltage produced to reach the systems' sensitive components
Wiki User
∙ 12y ago
Wiki User
∙ 11y agowhen a resistor is connected in a circuit it drop some voltage across it.when a circuit have large input voltage then by using a resistor of suitable value we get the desired voltage.
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A 4700ohms resistor rated as 5watts find out it maximum safe working current?
Power dissipated = I2 RI = sqrt( P/R ) = sqrt(5/4,700) = 32.6 mA . (rounded)Note:It's only "safe" if the power actually dissipates, i.e. doesn't just hang around the resistor.32.6 mA is 'safe' if the resistor is heat-sinked, or at least out in the open air. It's not safeif the resistor is wrapped in a cozy blanket.
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