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What is the bundle of nerves that forms a simple brain called? What types of circuit elements have a zero or near-zero voltage drop? How do I solve [f(x+3)-f(x)]/[x+3-x] when f(x) = 4-x^2? How do I solve f(x+3) when f(x) = 4-x^2? Let say we have 3380 W power supply that has 12V DC and 281.5 A output.Can we run a 12VDC motor 2A that need 24W power?