Two lamps one rated 40w at 220 v and the other 60w at 220 v are connected in parallel to the electric supply at 220v. a) calculate the current drawn from the electric supply?
b) calculate the total energy consumed by the two lamps together when they operate for one hour?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

What is the equation for electrical work?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)