power is the product of voltage and current.so we can
measure the value of power just by using ammeter and
voltmeter.......then why do we use a wattmeter?
- 5 Answers
- 7881 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / gajanan
apperent power = voltage X current,
we can calculate apperent power by ammeter and voltmeter
reading but
real power = voltage X current X power factor
to measure real power we need wattmeter
| Is This Answer Correct ? | 24 Yes | 1 No |
Answer / nageshwaran.n
No doubt, we could use Voltmeter & Ammeter for calculating
Power but only Apparent Power that too at that instant.
Apparent power = voltage X current,
Actual RMS Power (real power) = voltage X current X power
factor
And to measure real power we need Wattmeter only.
| Is This Answer Correct ? | 11 Yes | 0 No |
Answer / smita
RIGHT POWER IS VOLTAGE X CURRENT BUT FROM THIS WE GET ONLY
APPERENT POWER,AND WE REQIRE REAL POWER I.E VOLTAGE X
CURRENT X POWE3R FACTOR AND FOR THAT WE REQUIRE WATTMETER
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / pillay
Yes as all have already said you dont need to use a watt meter
only if the circuit uses a Direct Current voltage and you can
calculate the power mentally by just looking at the voltmeter and ammeter.
| Is This Answer Correct ? | 1 Yes | 0 No |
What is main purpose of chock coil and starter in florescent tube ?
why synchronization done in clockwise direction?
Is it reuired to use house service barcket for 31/2 core 300 Sq.mm cable,if the distance between pole & shop is around 2 mtrs only or can I hang the cable with GI support in air? upto what size of cable GI serrvice btacket is necessary?
what is diff b/w electrical & electronics ?
what is the minimum requirement gigaohms for the insulation test using 5kv in 300mm xlpe cable
Difference B/W A/C & D/C Motors..?
Where can I get CPWD electrical shedule rates in web? please help me.
how much percentage set in transformer diffrencialrelay
At what speed 1 HP motor can run an electric car of weighing 400 kg?
What is signal flow graph?
How to reduce -234126219.6403 MVAr generation and by what?
how much load 15kva dg set can bear.with full explination and how to calculate?
-
Civil Engineering (5085) - Mechanical Engineering (4451)
- Electrical Engineering (16632)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
