How do you find current with unknown resistance?
Just find the voltage of the known resistor w/ the ohmemeter, and use ohm’s law (i=v/r) to get the current, then use the current with the unknown r’s voltage & ohm’s law to get the resistance.
How do you find the value of an unknown resistor?
Calculating Resistance of Unknown resistor, total current and voltage across each resistor
- – Resistance of R2. Since it is given that total power is 60 watts, and the series circuit has 120v, then we can calculate total resistance to be RT = (120*120)/60 = 240 ohms.
- – Current in the circuit.
- – Voltage across each resistor.
How do you find unknown resistance in parallel?
Resistance for parallel circuits are calculated by the formula: 1/Req= 1/R1 + 1/R2.
How do you find the voltage drop in a current source?
Ohms law tells us that when a current, (i) flows through a resistance, (R) a voltage drop is produce across the same resistance. The value of this voltage drop will be given as i*RP. Then VOUT will be equal to the voltage drop across the resistor with no load attached.
How to calculate current and voltage in a circuit?
Closes this module. Let’s learn how to calculate current and voltage across each resistor in a circuit. Created by Mahesh Shenoy. This is the currently selected item. Posted a year ago. Direct link to yashodakasarla9876’s post “Sir, why the current remains same in series connec…”
How is the voltage across the resistance determined?
In summary, the voltage across the resistance (in this ideal circuit) is not determined by Ohm’s law, it is determined by the battery. When the resistance is ‘infinite’, the current through is zero by Ohm’s law.
Can there be voltage without current in an open circuit?
Thus, for an (ideal) open circuit (the limit as R → ∞ ), the current through is zero but the voltage across is fixed by the battery voltage. In summary, the voltage across the resistance (in this ideal circuit) is not determined by Ohm’s law, it is determined by the battery.
When is the voltage not determined by Ohm’s law?
In summary, the voltage across the resistance (in this ideal circuit) is not determined by Ohm’s law, it is determined by the battery. When the resistance is ‘infinite’, the current through is zero by Ohm’s law. Note that there is difficulty if we allow the resistance to go to zero.