# One lightbulb is marked 22W 120 V, and another 102W 120 V; this means that each converts its respective power when plugged…

One lightbulb is marked “22W 120 V,” and another “102W 120 V”; this means that each converts its respective power when plugged into a constant 120 V potential difference.

(a) Find the resistance of each bulb.

R22=

R102=

(b) How long does it take for 1.00 C to pass through the dim bulb?

s

How is this charge different upon its exit from, versus its entry into, the bulb?

When the charge emerges from the bulb, it has

—Answer— higher potential energy no change in potential energy lower potential energy

(c) How long does it take for 1.00 J to pass through the dim bulb?

s

How is this energy different upon its exit from, versus its entry into, the bulb?

Electric potential energy is

—Answer— transformed into heat only transformed into heat and light transformed into light only

(d) Find the cost of running the dim bulb continuously for29.0days if the electric company sells its product at \$0.0700 per kWh.

\$

What physical quantitydoesthe electric company sell?

The electric company sells

—Select— reactance charge power energy

.

What is its price for one SI unit of this quantity?

\$/Joule