motor efficiency

Help Support Talk Electrician Forum:

searley

Senior Member
Joined
Sep 12, 2008
Messages
320
Reaction score
0
help. if a motor`s input is 75w and it`s output is 50w.what will the motor`s efficiency be ?i was trying 75/50 and getting 1.5 but the answer is 33.3%.

see i do need help.cheers. :(

 

Theorysparky

Domestic Electrician
Joined
Feb 18, 2008
Messages
4,233
Reaction score
0
help. if a motor`s input is 75w and it`s output is 50w.what will the motor`s efficiency be ?i was trying 75/50 and getting 1.5 but the answer is 33.3%.see i do need help.cheers. :(
are you sure that is right ,,the answer ???

 
Joined
Jun 21, 2008
Messages
17,033
Reaction score
21
Apache makes it 66%. If you've managed to make one >100% can you PM me the plans ;)

How exactly is the question worded? Does it ask what the efficiency is OR what is lost.

 

DTIL

Junior Member
Joined
Jul 22, 2008
Messages
8
Reaction score
0
Apache makes it 66%. If you've managed to make one >100% can you PM me the plans ;) How exactly is the question worded? Does it ask what the efficiency is OR what is lost.
Exactly my thoughts

Power out/Power in = efficiency

Therefore 50/75 = 0.66 recurring (or 66%)

If they are asking for power lost, then it would equate to around 33% (rounding up/down)

 

searley

Senior Member
Joined
Sep 12, 2008
Messages
320
Reaction score
0
i worded it the way it is on the paper i was getting 66%.close to throwing calculater out the window.

 
Top