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3. A is contro lamp-dimming circur 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 В. 40 С. 20 D. 20 Q

3. A is contro lamp-dimming circur 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 В. 40 С. 20 D. 20 Q

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3. A is contro lamp-dimming circur 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 В. 40 С. 20 D. 20 Q
Transcribed Image Text:3. A is contro lamp-dimming circur 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 В. 40 С. 20 D. 20 Q
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