figure 4: Question 4a Two light bulbs, one 75 W and one 150 W bulb, are connecte
ID: 1482543 • Letter: F
Question
figure 4: Question 4a Two light bulbs, one 75 W and one 150 W bulb, are connected in parallel with a standard 120 volt ac electrical outlet. The brightness of a light bulb is directly related to the power it dissipates, Therefore, t he 150 W bulb appears brighter. How does the brightness of the two bulbs compare when these same bulbs are connected in series with the same outlet? EXPLAIN WHY. Figure 5 shows 3 patlis through a region of uniform magnetic field pointing out of the page. Table 1 gives masses, charges, and speeds of 3 particles that take these paths through the field in the directions shown. Which path in the figure corresponds to which particle in the table? Figure 5: Question 4cExplanation / Answer
Ques 1.
The bulbs will only appear brighter if the available current to the system is not limited. In that case the series bulbs will have a lower voltage across each individual bulb and they will appear dimmer. If the power input to the circuit is a constant than the total wattage output from all bulbs is also constant and the bulbs will all appear the same (assuming the filaments for the bulbs are all identical resistance).
In a typical simple circuit the power source will be a battery which attempts to hold a constant voltage across the circuit. In this case the voltage across the bulbs in parallel will be equal to the voltage of the battery and the current through the bulb will be defined by V=IR where R is the resistance of the filament. This means more current (and thus more power) will be drawn from a battery into the parallel circuit than a series one and the parallel circuit will appear brighter (but will drain your battery faster).
So, the bulb which will glow dimmer in series case.
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