Science & Technology Fundamentals

DC (Direct Current) power supply has zero frequency because the current flows in one direction only and does not alternate periodically like AC (Alternating Current). This is a duplicate of entry 72364.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC (Direct Current) power supply has zero frequency because the current flows in one direction only, unlike AC (Alternating Current) which periodically reverses direction. Frequency is the number of cycles per second, and DC has no oscillation or cycles.

DC power supply provides direct current which flows in one direction without changing direction or magnitude periodically. Unlike AC (alternating current) which oscillates and has frequency, DC has zero frequency.

Jupiter is the largest planet in our solar system, with a mass more than two and a half times that of all other planets combined. Saturn is the second-largest, while Venus and Pluto are much smaller.

Jupiter is the largest planet in our solar system, with a mass more than two and a half times that of all other planets combined. Saturn is the second-largest, while Venus and Pluto are much smaller.

In India, the standard residential voltage level is 230V as per Indian standards. Option B (240V) is approximately correct and commonly used in many countries. 415V is typically used for 3-phase industrial supply.

According to Newton's Second Law of Motion, force is what can change the motion of an object. The law states that F=ma, meaning force equals mass times acceleration. Velocity, mass, and speed are properties of the object itself, not external agents that change motion.

Battery backup systems like UPS are rated in Volt-Ampere (VA) which represents apparent power. KW (kilowatts) is for real power, while Ampere and Volt are individual components, not the complete power rating used for these systems.

Residential apartments can have either single-phase (1 phase) or three-phase (3 phase) power supply depending on the building's electrical design and load requirements. Three-phase is common in larger apartments while single-phase is typical for smaller units.

Voltage stabilizers are designed to manage power fluctuations by maintaining a constant output voltage despite variations in input voltage. Regulators and capacitors serve different purposes, while 'current stabilizers' is not a standard term.

Thomas Edison is credited with inventing the practical electric light bulb in 1879. While other scientists contributed to early electric lighting concepts, Edison developed the first commercially viable incandescent bulb with a long-lasting filament. Isaac Newton is known for physics laws, Graham Bell invented the telephone, and Marconi developed radio telegraphy.

The chemical symbol 'Sn' comes from the Latin word 'stannum', which means tin. Tin is a metallic element in group 14 of the periodic table. Zinc is Zn, sodium is Na, and tungsten is W (from wolfram).

Solar and hydro power are classified as non-conventional or renewable energy sources because they use naturally replenishing resources unlike fossil fuels. Non-conventional sources are sustainable alternatives to traditional coal, oil, and gas power generation.

Suzlon Energy is an Indian wind turbine manufacturer and has established itself as a major player in wind power generation equipment in India. While Siemens and ABB are global engineering companies, Suzlon specifically built its reputation on wind energy in the Indian market.

Arthroscopy is a minimally invasive surgical procedure used to examine and treat problems inside joints. It allows surgeons to view the joint interior using an arthroscope.

Copper is an excellent conductor of electricity due to its free electrons that can move easily through the metal. It's commonly used in electrical wiring. Plastic, rubber, and glass are insulators.

After Einstein's death in 1955, his brain was removed and preserved. It is currently housed at the Mütter Museum in Philadelphia, which is in the state of New Jersey. The pathologist Thomas Harvey took it without permission.

Type AB blood has both A and B antigens on red blood cells and no antibodies against either type in the plasma. This allows people with AB blood to receive red blood cells from any blood type (A, B, AB, or O) without having an immune reaction. Types A, B, and O all have antibodies that would attack some donor blood types.