Alan G. answered • 05/23/16
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Kylie,
You need a couple of formulas for these.
For the first question, the formula is V = IR, where V is the voltage, I is the current, and R the resistance.
For the second question, the formula is 1/R = 1/R1 + 1/R2 + 1/R3, where the R's are the resistances you are connecting in parallel, and R is the equivalent resistance.
I recommend you try to finish these questions without any help. If you get stuck, just post a reply and I (or someone else) will send more help.
Alan G.
Kylie,
Actually, the value for I you found is wrong. If I=14/40, it could not be 2.86 Amperes. You must recompute this.
As for the second question, the right side of the formula simplifies to 3/4, which means the equivalent resistance is 4/3=1.33 Amperes. Your work is ok, you just didn't finish stating the answer.
The idea behind a resistor is to impede the flow of electric current through it. This results in a voltage drop proportional to the current with the resistance as the proportionality constant. Voltage is measured in volts, resistance in ohms, and current in amperes.
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05/24/16
Kylie H.
05/24/16