The volt drop is different across each bulb. The 4.2W bulb uses the most power due to less resistance and will light up while the other two bulbs will use less power because smaller voltage but as you say the same current. The 4.2 W is the rating of the bulb (max power) so will probably light up to much and break.
The volt drop is different across each bulb. The 4.2W bulb uses the most power due to less resistance and will light up while the other two bulbs will use less power because smaller voltage but as you say the same current. The 4.2 W is the rating of the bulb (max power) so will probably light up to much and break.
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