Question

| a 60 w lightbulb and a 100 w lightbulb are placed in the circuit shown in figure ex28.9. both bulbs are glowing. a. which bulb is brighter? or are they equally bright?

Answer 1

In a series circuit, the light bulb with the higher power rating will be brighter. Therefore, the 100 W lightbulb is brighter than the 60 W lightbulb.

Step-by-step explanation:

In this circuit, the light bulbs are connected in series, which means that the same current flows through both bulbs. However, the bulbs have different power ratings, which are measured in watts. The power of a light bulb is directly proportional to the brightness of the bulb.

So in this case, the 100 W lightbulb will be brighter than the 60 W lightbulb. The 100 W bulb consumes more electrical power and therefore emits more light intensity compared to the 60 W bulb.

Answer 2

When a 60 W bulb and a 100 W bulb are connected in series, the 60 W bulb may be brighter due to having a higher resistance which causes it to dissipate more power.

Step-by-step explanation:

When two household lightbulbs rated at different wattages, specifically a 60 W lightbulb and a 100 W lightbulb, are connected in series to household power, the question about which bulb will be brighter can be answered by understanding the relationship between power, voltage, and current. In a series circuit, the same current flows through both bulbs, but the power dissipated in each bulb depends on their resistance. A bulb with a higher resistance will dissipate more power as heat and light when the same current flows through it.

The power rating on a bulb relates to its brightness (and heat generation) at its design voltage. However, when connected in series, both bulbs are subjected to the same current, but not necessarily the same voltage. The bulb with the higher resistance (usually the one with the lower wattage rating for bulbs designed for the same voltage) will have a larger voltage drop across it and will therefore dissipate more power and be brighter. Hence, in this case, the 60 W bulb may be brighter because it is likely to have a higher resistance than the 100 W bulb.