Given that the lightbulb is rated 120 V, 0.75 A 40 Ω V₂ Bulb Find the current across the 40-ohm resistor O 0.25 A O 0.75 A O 1.5 A O 2.25 A 80 Ω

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Q: he longer the length of the ar he Arc Resistance. Select one: O True O False

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Q: a b 60Ω ΜΕ 10Ω 30Ω 200

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Q: For the following circuit in figure 3, the switch is closed at t=0 R1 L1 1mH V1 =10 V Figure 3

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Q: 120 V 60 Hz 68 µF 2.2 k2 (b) FIGURE 4-40

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).