Question

Which statement is TRUE? Question 13 options: In a series circuit, as light bulbs are added, the bulbs dim. In a parallel circuit, if one bulb goes out, all of the bulbs will go out. In a series circuit, if one bulb goes out the other bulbs will stay lit. In a series circuit, the resistors do not share the current.

Answer 1

Answer:

In a series circuit, as light bulbs are added, the bulbs dim

Explanation:

In a series circuit, as light bulbs are added, the bulbs dim because of two reasons.

1. In a series circuit, there is only one path for the current to flow and as more bulbs are added, their resistance gets added too, which results in less current.

2. In a series circuit, voltage across each bulb is different, as more bulbs are added, the voltage across each bulb becomes less and less.

Since the brightness of the bulbs is dependent on voltage and current

P = V*I

Both of these quantities are decreasing as the number of bulbs are increasing therefore, resulting in less power dissipation and eventually, less brightness.

Other options:

• In a parallel circuit, if one bulb goes out, all of the bulbs will go out. False, In a parallel circuit, if one bulb goes out, then there is still a path left for the current to flow, therefore other bulbs are not affected.
• In a series circuit, if one bulb goes out the other bulbs will stay lit    False, In a series circuit, there is only one path for the current to flow, when one bulb goes out then it blocks the way of the current and therefore, other bulbs get affected and will not stay lit.
• In a series circuit, the resistors do not share the current.                    False, In a series circuit, the resistors share the same current since there is only path for the current to flow therefore, each resistor get the same current.

Answer 2

The only statement which is true is:
In a series circuit, the resistors do not share the current.

In fact, when resistors are put in series, the current I crosses all the resistors with same intensity, and so the resistors are all crossed by the same value of the current.