Question

section 4 // question 2
which of these things
would make bulbs in a
circuit get brighter?
choose your answer by clicking one of the
options, then click \ok\
a adding more bulbs
b using a more powerful cell
c adding more wires
d removing a cell

Explanation:

Step1: Analyze each option

• Option a: Adding more bulbs in a circuit (in series) would divide the voltage among more bulbs, making each bulb dimmer. In parallel, adding more bulbs increases the current draw but if the power source can't supply enough, it might not make them brighter. Overall, this is unlikely to make bulbs brighter.
• Option b: Using a more powerful cell (higher - voltage battery) increases the voltage in the circuit. According to \(P = \frac{V^{2}}{R}\) (for a bulb with resistance \(R\)), when \(V\) (voltage) increases, the power \(P\) (which is related to brightness) increases.
• Option c: Adding more wires (assuming proper connection) doesn't directly affect the voltage or current in a way that would make the bulbs brighter. Wires are just conductors, and as long as the circuit is complete, adding more wires (in a normal circuit setup) won't change the power to the bulbs.
• Option d: Removing a cell (lowering the voltage source) would decrease the voltage in the circuit. Using \(P=\frac{V^{2}}{R}\), a decrease in \(V\) leads to a decrease in \(P\), so the bulbs would get dimmer.

Answer:

B. Using a more powerful cell