What are three factors that affect the flow of current in a circuit?
Answer. Answer: Voltage, resistance, and whether the circuit is wired in series or parallel. The current in a circuit depends on the applied voltage and the resistance of the circuit.
Why do we say current flows from positive to negative?
The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.
What happens if current is negative?
So, if you get a negative current, that means that it flows in the direction opposite you assumed. The power dissipated on the ohmic load is proprtional to the square of the current. So the power always flows from the source (a battery, for example) to a load.
What is the significance of negative voltage and current?
1 Answer. Negative potential difference means,current can’t flow in that direction,as current flows from high potential to low potential zone. Not on to the opposite direction. So,actually if potential difference is negative,current should flow on to the opposite direction.
What is the meaning of negative sign in the expression of induced emf?
The negative sign signifies that the induced emf always opposes any change in the magnetic flux.
What is the physical significance of negative sign appearing in the Faraday’s law?
The negative sign in Faraday’s law comes from the fact that the emf induced in the coil acts to oppose any change in the magnetic flux. This is summarized in Lenz’s law. Lenz’s law: The induced emf generates a current that sets up a magnetic field which acts to oppose the change in magnetic flux.
What does negative sign signify in a direction?
A negative sign on a force always means that the force is acting in the defined negative coordinate direction. If the object’s velocity is also negative, the force does NOT opposed the motion.