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When using Planck's constant, how do I know when to use electron volts or joules? Planck's...

When using Planck's constant, how do I know when to use electron volts or joules?

Planck's constant may be written as 6.63 x 10^-34 Js or 4.14 x 10^-15 eVs right? But how do I choose which one I should use to figure out an answer to a question?

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h=6.63x10-34 Js = 4. 14x10 ls evs in Joule in election volts I suggest always use h=6.63x10-34 Js calculate energy into Jule

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