Physics

Physics, 26.07.2019 03:30, mg0508092

What is the power p supplied to a resistor whose resistance is r when it is known that it has a voltage î´v across it?

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Mathematics, 13.07.2019 18:00, Geo777

For a resistor in a direct current circuit that does not vary its resistance, the power that a resistor must dissipate is directly proportional ti the square of the voltage across the resistor. the resistor must dissipate 1/16 watt of power when the voltage across the resistor is 14 volts. find the power that the resistor must dissipate when the voltage across it is 42 volts.

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Physics, 22.07.2019 21:40, Zshotgun33

Each of the four circuits in the drawing consists of a single resistor whose resistance is either r or 2r, and a single battery whose voltage is either v or 2v. the unit of voltage in each circuit is v = 12 v and the unit of resistance is r = 6 ω. determine (a) the power supplied to each resistor and (b) the current delivered to each resistor.

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Engineering, 20.09.2019 22:30, vitanoeymailcom705

Alight-emitting diode (led) is a component that produces light. when an led has current running through it, we sometimes make the rough approximation that the voltage across the led is constant regardless of how much forward current is flowing through it (within a certain range of current). this approximately constant voltage is given the designation vf. led data sheets specify the current to be used through the device when lighting it; this current is given the designation if.choose a resistor r1 (specify a resistance and power rating as your answer) to be used in the following circuit to illuminate a red led with a vs = 6 v battery. this red led has if = 20 ma and vf = 1.4 v. use the smallest power rating possible for the resistor; you have the following resistor power ratings available: 1/16 w, 1/8 w, 1/4 w, 1/2 w, and 1w. the actual power dissipated by the resistor should not exceed the power rating of the resistor you choose. (you do not need to choose a standard resistance value for the resistor.)

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Physics, 21.09.2019 08:20, catuchaljean1623

What is the power p supplied to a resistor whose resistance is r when it is known that it has a voltage δv across it?

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