DC Circuits Quiz

Potential or voltage is the capacity of a charged body to do work. The unit of potential or voltage is joule/coulomb or Volt (V), which can be expressed as $V = \rac{W}{Q}$.

Electric current is the flow of electron in a closed circuit. It is also defined as the amount of charge passing through the conductor in unit time. The unit of electric current is Ampere (A), which is equivalent to charge/second or $A = \rac{Q}{t}$.

Conventional current is the flow of positive charges, which is opposite to the actual flow of electrons. Electron current is the flow of actual negatively charged electrons in a circuit.

<p>Potential difference is the difference of electrical potential between two charged bodies. It is measured in Volts (V). If the potential of body A is +12V and the potential of body B is +7V, then the potential difference is +5V, expressed as $(+12V) - (+7V) = +5V$.</p> Signup and view all the answers

<p>Free electrons are the outermost electrons in an atom, which are not bound to any particular atom and can move freely in the conductor. They play a crucial role in the flow of electric current in a conductor.</p> Signup and view all the answers

<p>Thévenin's theorem states that any linear electrical network containing only voltage sources, current sources, and resistances can be replaced at terminals A–B by an equivalent combination of a voltage source Vth in a series connection with a resistance Rth.</p> Signup and view all the answers

<p>The equivalent resistance Rth is the resistance that the circuit between terminals A and B would have if all ideal voltage sources in the circuit were replaced by a short circuit and all ideal current sources were replaced by an open circuit. Rth could alternatively be calculated as Vth divided by the short-circuit current between A and B when they are connected.</p> Signup and view all the answers

<p>The equivalent voltage Vth is the voltage obtained at terminals A–B of the network with terminals A–B open circuited.</p> Signup and view all the answers

<p>The current flowing from A and B will be Vth divided by Rth.</p> Signup and view all the answers

<p>A linear electrical network in Thévenin's theorem can contain only voltage sources, current sources, and resistances.</p> Signup and view all the answers