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Yup, think of amps as "volume" of electricity that is "drawn" or "sucked" through circuit. Technically an amp is coulombs/sec, so it is like volume. Or gallons/sec. flowing through garden hose.
For example, a 55w headlight draws... 55w/12v=4.58 amps. You can hook up an amp-meter to the white-wire and use that to power 55w headlight and what will the amp-meter read? 4.58amps! Doesn't matter one bit that fuse for that circuit is 30-amps, that's just maximum for that circuit based upon supply and wiring-diameter. But usage is dependent upon resistance of circuits which determines the draw amperage.
Then if you hook up second headlight to white-wire, what will amp-meter say? 2x4.58amps = 9.16amps and so on. Up to.. the 30-amp limit of that circuit. So you'd have to hook up A LOT of headlights to reach the 30-amp limit.
Circuit will only provide as much "volume" or "amps" as a device draws. No more, no less. Up to limit of circuit and then you'll blow fuse.
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