A capacitor stores electrical energy in the form of electric field because the DC source creates and excess of electrons on the negative plate and a shortage of electrons on the positive plate. The electrostatic attraction between the positive and negative charges keeps the charge intact in the capacitor, even when the voltage source is removed.
The given image represents a diode. A diode is a two terminal electrical equipment which conducts electrical current in one direction only.
The formula for finding electrical power is Power = Voltage x Currerent or P=VI. Rearranged we have I = P/V = 800/120 = 6.67 ? 7 amperes
Ohm's law states that V=IR. According to the law, voltage is directly proportional to both current and resistance while current is inversely proportional to the resistance.
Frequency is the number of occurrences of an event per unit time. The relationship between the frequency and time period of an AC signal is f=1/T i.e. frequency is inversely proportional to the time period of an AC signal. The smaller the time period, the greater the frequency of the signal.
The given symbol represents an earth ground which is used for zero potential reference and electric shock protection.
Frequency is the number of occurrences of an event per unit time and can be expressed as Hz. In DC, the charges flow steadily in one direction while charges keep switching directions in AC. Since no switching (events) occur with DC, the frequency is zero.
Capacitors are added in parallel. In the given question, four capacitors (each having 4 F capacitance) are connected in parallel then their equivalent capacitance would be 4+4+4+4=16 F.
The ideal fuse should carry its rated current indefinitely and it should melt quickly on small excess of the current.
Power is the rate of doing work i.e. Power = Work/time = J/s. Electrical power is described as P=VI and the unit of power is Watt (W). Power is the product of current and voltage, so it can also be written as V.A where V represents the voltage and A represents the current.
When a current is flowing through an inductor, an energy is stored in the form of magnetic field. The formula of energy stored in an inductor is: Energy=(1/2)LI^2.
The given electrical symbol represents a galvanometer. A galvanometer is a type of sensitive ammeter. It is an instrument for detecting electric current.
The generated force on a current carrying wire is directly proportional to the amount of current flowing, the length of the wire, and the strength of the magnetic field. Increasing any of these will increase the force on the wire and the capacity to do work.
A transfomer is a static device so it has no mechanical losses. A transformer only transforms the voltage and the current and the frequency remains same during the transformation process. The power on primary side of an ideal transformer is equal to the power on the secondary side. It the transformer is step-down then the voltage on secondary side must be less than the voltage on its primary side which means that the current on secondary side must be higher than the current on its primary side.
The basic operation of a transformer is to step up or step down the voltage in the circuit. If the transformer is a step up then it will step up the voltage and step down the current to maintain the power (i.e. P=VI) in primary and secondary sides of the circuit.
A capacitor is a passive two-terminal electrical equipment used to store electrical energy electrostatically in an electric field. It is also known as a condenser.
If three different resistances are connected in parallel and a voltage is applied across them then the voltage is same across all the resistances. The formula for finding power is P = VI = V(V/R) = (V^2/R). According to the formula, the resistor with the least value will have the maximum power loss and the resistor with the maximum value will have the least power loss.
