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5. A 120V lamp-dimming circuit is controlled by a rheostat and protected from the excessive current by a 3A fuse. The lamp resistance is predicted at 20 ohms. What is the minimum resistance value can the rheostat be set without blowing the fuse? A. 40 Ω С. 2 0 В. 40 D. 20 2

5. A 120V lamp-dimming circuit is controlled by a rheostat and protected from the excessive current by a 3A fuse. The lamp resistance is predicted at 20 ohms. What is the minimum resistance value can the rheostat be set without blowing the fuse? A. 40 Ω С. 2 0 В. 40 D. 20 2

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5. A 120V lamp-dimming circuit is controlled by a rheostat and protected from the excessive current by a 3A fuse. The lamp resistance is predicted at 20 ohms. What is the minimum resistance value can the rheostat be set without blowing the fuse? A. 40 Ω С. 2 0 В. 40 D. 20 2
Transcribed Image Text:5. A 120V lamp-dimming circuit is controlled by a rheostat and protected from the excessive current by a 3A fuse. The lamp resistance is predicted at 20 ohms. What is the minimum resistance value can the rheostat be set without blowing the fuse? A. 40 Ω С. 2 0 В. 40 D. 20 2
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