Contents
Can a resistor have no voltage drop?
No, there is zero volts across a resistor, by Ohm’s Law, when there is zero current through the resistor. If the load is an open circuit, there is zero current through RS and so, the voltage across RS is 0V.
Why does voltage not drop across a resistor?
With two resistors in series, there’s more total resistance on the circuit, which means that less current flows. With less current flow, a given resistor drops less voltage because V=IR. Voltage drop isn’t an intrinsic property of the resistor; resistance is.
Is voltage drop and resistance the same?
By Ohm’s Law, the voltage drop is proportional to the current flowing through a resistor. (So in several series resistors with the same resistance, the drop across each one is the same, since the current across each one is the same).
Do the values of the voltage drop across the resistors differ Why?
The voltage drop (I•R) will be the same for each resistor since the current at and the resistance of each resistor is the same. Thus the electric potential difference across any one of the bulbs will be the same as that across any one of the other bulbs.
How do I calculate resistance when I have the voltage drop?
You could either measure it directly with your meter, or you could use the voltage across the 1K resistor and the fact you know its a 1K resistor to calculate the current through the resistor. Since the resistor is in series with the LDR, the current through both should be the same. It’s a voltage divider, basic rule: Keep the ball flat..
Why does a resistor only drop one volt?
Actually, the resistor produces a drop in potential (that is, potential energy per unit charge). If one resistor only drops one volt from the original voltage (only drops one volt because of its resistance value) and we add another resistor in series with the same value, then that second resistor would also drop one volt.
How much voltage is consumed by each resistor?
Since the total current has changed, we need to recalculate our the amount of voltage consumed by each resistor. For each resistor (since they have identical resistance values), the total voltage drop is now 6V (V = I * R = 1 * 6 = 6). Since there are two resistors, the total voltage drop is 12V, which is equivalent to the supplied voltage.
What happens when you add a second resistor?
If one resistor only drops one volt from the original voltage (only drops one volt because of its resistance value) and we add another resistor in series with the same value, then that second resistor would also drop one volt. Then, the current leaving the second resistor would be 2 volts less.