Bài 1: Một đoạn mạch gồm R1= 8 ôm; R2=12 ôm. Biết R1 nối tiếp với đoạn mạch gồm R2 song song với R3, R3= 1/2 R2 cường độ dòng điện qua mạch chính là 2A. a. Hãy vẽsơ đồmạch điện trên
b. Tính điện trởtương đương toàn mạch
.Tính cường độdòng điện qua mỗi

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Identify the type of heat transfer occurring when chocolate melts in your hand

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)