Table of Contents
What is the direction of the flow of current?
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.
Does current flow from positive to negative in resistor?
Fig. CONVENTIONAL CURRENT − Flows from positive to negative.
Why we take direction of current from positive to negative?
Also, since electrons move from lower potential to higher potential in an electric field, the current thus flows the opposite and it is easier to visualize current flowing from a higher potential to a lower potential.
What type of quantity is current?
scalar quantity
Electric current is a scalar quantity. Any physical quantity is defined as a vector quantity when the quantity has both magnitude and direction but there are some other factors which show that electric current is a scalar quantity . When two currents meet at a point the resultant current will be an algebraic sum.
What is the direction of conventional current *?
The direction of the conventional current is from positive to the negative termianl of the battery. Where as the electrons flow from the negative terminal of the battery to the positive terminal of the battery which is exactly opposite to the conventional direction.
How can I calculate the current across a resistor?
Understand parallel circuits. Imagine a wire leaving one end of a battery,then splitting into two separate wires.
What is the current in through each resistor?
The current through the circuit is the same for each resistor in a series circuit and is equal to the applied voltage divided by the equivalent resistance: I = V RS = 9V 90Ω = 0.1A . Note that the sum of the potential drops across each resistor is equal to the voltage supplied by the battery.
Does current flow through a resistor or across a resistor?
No current will flow through a resistor when the voltage across the resistor is 0V — or to put it another way, when the potential at each end of the resistor is the same. If the resistor is connected to a current source, then while there is a flow of current through the resistor, there will be a voltage developed across the resistor.
What is the current flowing through this resistor?
According to Ohm’s law, the voltage drop, V, across a resistor when a current flows through it is calculated using the equation V = IR, where I equals the current in amps (A) and R is the resistance in ohms (Ω). Another way to think of this is that V is the voltage necessary to make a current I flow through a resistance R.