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# 09HW4 - Niu(qn269 Homework#4 antoniewicz(58855 This...

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Niu (qn269) – Homework #4 – antoniewicz – (58855) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 4.0 points A battery with an internal resistance is con- nected to two resistors in series. E X Y 4 Ω 16 Ω 20 Ω 0 . 3 A internal resistance What is the emf E of the battery? 1. E = 13 . 2 V 2. E = 10 . 8 V 3. E = 12 . 0 V 4. E = 1 . 2 V 5. E = 6 . 0 V 002 (part 2 of 3) 3.0 points What is the potential difference across the terminals Y and X of the battery? 1. V Y X = 13 . 2 V 2. V Y X = 1 . 2 V 3. V Y X = 6 . 0 V 4. V Y X = 10 . 8 V 5. V Y X = 12 . 0 V 003 (part 3 of 3) 3.0 points What power P internal is dissipated by the 4 Ω internal resistance of the battery? 1. P internal = 3 . 6 W 2. P internal = 1 . 2 W 3. P internal = 4 . 8 W 4. P internal = 0 . 36 W 5. P internal = 3 . 2 W 004 (part 1 of 5) 2.0 points A string of 24 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 79 W. What is the equivalent resistance of the light string? Answer in units of Ω. 005 (part 2 of 5) 2.0 points What is the resistance of a single light? An- swer in units of Ω. 006 (part 3 of 5) 2.0 points How much power is dissipated in a single light? Answer in units of W. 007 (part 4 of 5) 2.0 points One of the bulbs quits burning. The string has a wire that shorts out the bulb filament when it quits burning, dropping the resistance of that bulb to zero. All the rest of the bulbs remain burning.

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