(Solved): Concepts to remember & Formulas: Ohms Law: Voltage difference between ends of component = Curre ...

Concepts to remember $\&$ Formulas: Ohms Law: Voltage difference between ends of component = Current through it in Amps times the resistance of that component in Ohms. $\mathrm{V}=\mathrm{I}R$ (Does not apply to batteries) Power (rate of electrical energy conversion in a component) in Watts (Joules/sec) is product of voltage across it and current through it: $\mathrm{P}=\mathrm{V}$ I Resistors in series: $\mathrm{R}=\mathrm{R}1+\mathrm{R}2+\mathrm{R}3+\dots$ Resistors in parallel $\mathrm{R}=\frac{1}{(1/\mathrm{R}1)+(1/\mathrm{R}2)+\dots }$ Rules: Any points connected by a wire are at the same voltage (assuming wires have no resistance) Components connected in series must have the same current. Components connected in parallel have the same voltage across them. When 3 or more wire segments come together, the sum of the currents entering the junction must equal the sum of the currents leaving it. Battery is 12 volts in all diagrams. $\mathrm{R}1=1?,\mathrm{R}2=2?,\mathrm{R}3=3?$ Each diagram is for the same-numbered question. 1 a) What is the voltage across $\mathrm{R}1$, the current through it, and the power (rate of energy conversion) in it.