What is the difference in writing strength as 力 or 力量 ?
I have seen it both ways and am not sure of the difference.
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We say 电力 electric power instead of 电的力量; 马力， horsepower, instead of 马的力量，魄力，guts instead of 魂魄的力量，etc.
We say 有力的反击，effective strike back, instead of 有力量的反击。大力的支持，fully support, instead of 大力量的支持，etc.
we use 力量 as a separate word, e.g, 我们的力量, our strength, 团结的力量， unity,s strengths , 集体的力量，groups power, we don't say 我们的力 or 团结的力。
There is an idiom, 群策群力，power of team work. There is a phrase, 团队的力量， power of team work.
From the above, I will say 力 and 力量 mean merely same, the difference is 力 mostly used as part of a phrase while 力量 is used as a separate word.