A light bulb glows because it has resistance. The brightness of a light bulb increases with the

Question:

A light bulb glows because it has resistance. The brightness of a light bulb increases with the electrical power dissipated in the bulb.

(a) In the circuit shown in Fig. Q25.14a, the two bulbs A and B are identical. Compared to bulb A, does bulb B glow more brightly, just as brightly, or less brightly? Explain your reasoning.

(b) Bulb B is removed from the circuit and the circuit is completed as shown in Fig. Q25.14b. Compared to the brightness of bulb A in Fig. Q25.14a, does bulb A now glow more brightly, just as brightly, or less brightly? Explain your reasoning.

Figure Q25.14

(a) (b) Bulb A Bulb A Bulb B