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17. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
(a) 40 Ω
(b) 4 Ω
(c) 2 Ω
(d) 20 Ω
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