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All answers having "Electrical unit" as clue:

3 Character Answers:

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AMP

MHO

OHM

REL

RHO

VAR



4 Character Answers:

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VOLT

WATT



5 Character Answers:

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FARAD

HENRY

TESLA



6 Character Answers:

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AMPERE



7 Character Answers:

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COULOMB



8 Character Answers:

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KILOVOLT



10 Character Answers:

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VOLTAMPERE