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What is the equivalent resistor between terminals A and B?
The resistance between terminals a and b in the figure below is 25 ohms.
How do you find the equivalent resistor?
The equivalent resistance of a 4-Ω and 12-Ω resistor placed in parallel can be determined using the usual formula for equivalent resistance of parallel branches: 1 / Req = 1 / R1 + 1 / R2 + 1 / R3 Now the Ohm’s law equation (ΔV = I • R) can be used to determine the total current in the circuit.
What is the formula of resultant resistance?
According to Ohm’s law, the voltage drop, V, across a resistor when a current flows through it is calculated by using the equation V=IR, where I is current in amps (A) and R is the resistance in ohms (Ω). This implies that the total resistance in a series is equal to the sum of the individual resistances.
What do you need to know about electrical resistance?
Critical teaching ideas. The concepts of electrical resistance and electrical current are closely intertwined and need to be taught at the same time. Electrical resistance is the property of materials that results in energy being required to maintain an electric current in the material.
What is the resistance of an electric iron?
The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron ? Please log in or register to add a comment.
What is the resistance between a ground and a voltage source?
There is no longer any resistance from the bulb between the voltage source and ground, so the resistance has gone down to nearly zero. If we re-arrange our formula (I=V/R) and plug in our new resistance (let’s assume 0.001Ω or 1mΩ), we get 120V/0.001Ω = 120,000 A.
How does the scientific model of electrical resistance work?
The scientific model of electrical resistance is of the moving charged particles colliding with the particles which comprise the structure of the material through which the current is passing. An energy input is needed to maintain the current because energy is continuously being transformed into heat during these particle collisions.