Which event is associated with tornados?

Please tell me I really need help

This is the substance(s) formed in a chemical reaction.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery