Which of the following is (are) true in respect of the electric current used at your home? a) Microwave Oven and television uses dc current b) Refrigerator and washing machine uses ac current c) Air cooler and air conditioner uses ac current d) Most of the devices use 220 ampere current e) Magnitude of current passing through different devices is same

AC Current

• In contrast to direct current (DC), which only flows in one direction, alternating current (AC) is an electric current that changes direction periodically and continuously over time.
• Electricity is typically supplied to homes and businesses in the form of alternating current, which is also the type that is typically utilized by consumers when they plug in electric lamps, televisions, fans, and kitchen appliances to a wall outlet. Most of the devices use 220 V of current. Hence, statement 4 is incorrect.
• When referring to changes in voltage or current, the abbreviations AC and DC are frequently used interchangeably.
• Air conditioner and air cooler is one such example.
• Hence statement 3 is correct.
• Refrigerator: a machine or compartment that is used to store food and drink but is actually kept cool. Most modern refrigerators use the cooling effect caused by forcing an unpredictable fluid to evaporate in a fixed structure, where it tends to be consolidated back into fluid outside the cooler. Hence, statement 2 is correct.
• Microwave Oven: Microwave is basically wave, so it is AC. ‘Micro’ indicates very small period of the wave hence it is very high frequency AC signal. Hence, statement 1 is incorrect.

DC Current

• Electric charge flows in only one direction with direct current (DC).
• An excellent illustration of DC power is an electrochemical cell.
• Direct current can travel through a conductor like a wire, semiconductors, insulators, or even a vacuum like in electron or ion beams.
• Electric current is distinct from alternating current (AC) by its constant direction of flow.
• Galvanic current was once the name given to this kind of current.
• DC generator: A DC generator is a type of generator that generates DC power supply by converting mechanical energy into DC electricity.
• DC motor: Due to the magnetic field's attraction and repulsion, DC powers are generated, and the rotor begins to rotate. When precise speed control over a large range or high torque are required, DC motors are used.
• Battery: A DC power supply is used to recharge any battery because, with DC, the electrons will flow back into the battery in the same direction, creating the potential difference needed when the battery is fully charged.