A) what is the resistance of a lightbulb that uses an average power of 25.0 w when connected to a 60.0-hz power source having a maximum voltage of 170 v?

To solve this problem we will start considering the relationship between rms voltage and the maximum voltage. Once the RMS voltage is obtained, we will proceed to find the system current through the given power and the voltage found. Finally by Ohm's law we will find the resistance of the system

The relation of RMS Voltage is,

Note that this conversion is independent from the Frequency.

Now the current is,

By Ohm's Law

Replacing,

Therefore the resistance of this lightbulb is

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.