adspace


Explain the power rating of a bulb, say 60W, what if the
voltage changes

Answer Posted / md. obaydur rahman

All the above answers are wrong because we know that for a
constant power rating,
P=V*I
i,e. I=P/V
From the above equation we can see that if the voltage
changes the current is also changed for a constant power
rating i,e. if voltage reduced the device draws more current
to consume its power rating and vice versa.

Is This Answer Correct ?    6 Yes 7 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

PLZ sent the previous year question paper for GET in NHPC on my EMail id ppshanker@gmail.com

5528


plz tel me syllabus and exam date 4 jr executive engg (electrical)

2063


Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0

3755


Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studies in Not Possile ? Q2)Why majority of Buses in power system are load buses Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ? Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason

2028


What the main causes of transient interruptions on Over-Head Distribution Lines?

2229


previous year paper of ntpc bhel for degree in electrical enng

3288


Dear All we are having a problem in G120 BOP showing alarm A0503, F0052, F0060 we can not remove fault alarm ,Please any body help us. kowsar

1972


what is the minimum pay scale for electrical engineer (building construction)in kuwait? plz revert back with yrs of experience & pay scale respectively.

2253


hi this is hema can anyone mail me previous years questions for the APPSC-A.E.E (in electrical stream.) ......thank u.

1997


Hi all I had applied for the RRB test in the ELECRICAL category. I would be pleased if any of you can sent me previous year question papers. Please forward the question papers to varshashahi@yahoo.com Thanks and regards Varsha

2248


Why neutral point is consider as zero potential?

2752


Diagram and details of polarity test for Current Transformer 11kv 400/200/100/1A

3121


what is thermal resistance of PVC Cable.

1893


how to avoid electrical shock how capacitor store charges wat are the speed control of induction motors state faradays law flemings left hand rule what is rotary converter wat is transmission and distribution what are the sources of energy abrevation of acb,vcb,sf6,igbt what is output equation of transformer which test copper iron and iron loss are calculated what is eddy current draw a single line diagram (10 marks) draw direct online starter(10 marks)

2061


1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.

3450