Ohms

[NA19]

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This is from Examkrackers.

How are these two things equal to 1 ohm?
(a) A/V
(b) V^2/W

...I think the A is meant to signify amperes but I'm not sure.

 

[Deadlifts]

This is from Examkrackers.

How are these two things equal to 1 ohm?
(a) A/V
(b) V^2/W

...I think the A is meant to signify amperes but I'm not sure.

Ohms are a unit of resistance.

Ohm's law states that V = I*R, which is how you get (a). You or your source has a typo, though. Resistance is volts per ampere, not amperes per volt.

Combine Ohm's and Joule's Laws and you get power in a circuit: P = (I^2)R = (V^2)/R. Rearrange the equation with V and R and you get volts squared over watts (b).