Recent content by alwaysdazed

okay so then i use l=1 to find the resistance and i take the current that i found usuing p=iv and plug both into P=I^2R .. once i find that P how do i incorporate finding time?

L being the length of the wire and A being the cross sectional area of the wire

ohhh yeah that's what my problem is i am not given L .. i am trying to use R=(rho(resistivity)*L)/A

Homework Statement A flashlight bulb rated at 1.4W and 4.0V is operated by a 9.0V battery. To light the bulb at its rated voltage and power, a resistor is connected in series as shown in the figure. ( i don't know how to paste the picture but its only a resistor and then light bulb in...

thanks but i do not understand what you are saying sorry :(

Homework Statement A small city requires about 19 MW of power. Suppose that instead of using high-voltage lines to supply the power, the power is delivered at 120 V . Assuming a two-wire line of 0.60cm -diameter copper wire, estimate the cost of the energy lost to heat per hour per meter...