Which of the following expressions represents the first law of thermodynamics? [AFMC 1997; AIPMT...

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Which of the following expressions represents the first law of thermodynamics?
[AFMC 1997; AIPMT 2000; Karnataka CET (Med.) 2000, 01; MPPMT 2002]
(a) \( \Delta U=-q+w \)
(b) \( \Delta U=q-w \)
(c) \( \Delta U=q+w \)
(d) \( \Delta U=-q-w \)
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