(a) what is the rate at which energy being delivered to a light bulb higher : just after it is turned on , the glow of the filament is increasing , or after it has been on for a few seconds and the glow is steady ?
(b) IF a piece of wire is used to connect points `b and c` in Fig. 7.9, does the brightness of bulb `R_(1)` increase , decrease or stay constant ? What happens to the brightness of bulb `R_(2)` ? `(I_(1) = I_(2) = I)`
(c) Compare the brightness of four identical light bulbs in ` Fig. 7.10`. What happens if the bulb `A` fails so that it cannot conduct ? What if `C` fails ? What if `D` fails?
(d) If electric power is transmitted over long distances, the resistance of the wires becomes significant. Why ? Which mode of transmission would result in less energy losss: high current and low voltage or low current and high voltage ? Discuss.
(e) In `Fig. 7.11`, describe wha happens to the light bulb after the switch is closed . Assume the capacitor has a large capacitance and is initially uncharged.
(f) Astuident claims that a second light bulb in series is less bright than the first , because the first bulb uses up some of the current . How would you respond to this statement ?
(g) If you were to design an electeric heater using nichrome wire as the heating element , what parameters of the wire would you vary to meet a specific power output , sch as `1000 W`?