What is the resistivity range of metals.

What is the resistivity and current density? Give their SI unit.

What is the resistance of ideal ammeter.

What is the frequency range of the visible portion of the electromagnetic spectrum?

What is internal resistance of a cell?

An electric lamp of 100Omega , a toaster of resistance 50Omega , and a water filter of resistance 500Omega are connected in parallel to a 200V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

what is the frequency range of VHF ?

What is the wavelength range of gamma -rays ? State two uses of gamma -rays.