R1 nối tiếp (đèn song song mn) Có r1=20 ôm, đèn:20v-100w , mn là 1 dd bằng nhôm có l=5000m s=0,2mm^2
a) tính r đèn, r mn ??
b)u=220v, r biến trở bằng 100v hỏi Pđèn P biến Pr
c) r biến trở = 100 ôm đèn sáng bình thường u=?

Select the correct answer from each drop-down menu. compared to its surroundings, the concentration of solutes is low inside a cell. so, the cell is with respect to its surroundings. a particular solute in this cell uses energy for its transport from the cell to its surroundings. this type of transport is called

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above