Srinath

• Oct 6th, 2016

Can you elaborate the reason why we have cos angle for active power and sine angle for reactive power?

ABC

• Sep 4th, 2011

Bcz in impedence triangle(cos=b/h) R(resistance) is in the base and imepedence is hypotaneous.
power factor(cos )=R/Z. THATS WY WE are using cos in the power factor notation.

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How will you determine what frequency the device has without using oscilloscope?

Er.Anju

 Profile Answers by Er.Anju Questions by Er.Anju

• Dec 21st, 2010

The frequency of a device can also be calculated by the method below:- Speed of light (c) =299,792,458 m/s. Planck constant (h) =4.13566733E'15 eV s (1E-15 denotes "10 in power -15") Frequency(Hz) = ...

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At what voltage does landline telephone operate?

Mayank19

 Profile Answers by Mayank19 Questions by Mayank19

• Aug 29th, 2010

I tried to measure ring voltage, and showed inside the house 34V A/C, but measuring at the NID seems to show 10V? and change. Maybe caller-ID messes up the signal? Line is -51V DC. DSL is on the same line and is perfect 6016/768 and call quality is clean.

kotiannireeksha

 Profile Answers by kotiannireeksha Questions by kotiannireeksha

• Aug 3rd, 2010

The normal telephone system works on -48vDC on hook when the phone goes off hook, the voltage drops to about 10v but reverses polarity.

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How we can measure frequency without CRO ?

vasanthmadhu

 Profile Answers by vasanthmadhu Questions by vasanthmadhu

• Aug 12th, 2010

We can also measure frequency by Frequency meter and frequency analyzer.Please check it out.

gniranjan25

 Profile Answers by gniranjan25 Questions by gniranjan25

• Jul 14th, 2010

Digital Multimeter

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