In a house 450 units electric - energy is used , then what would be this energy in joule ?
(b) " Green seeds of foodgrains are drying in the sunlight . " State work is done in this case or not ?

How much energy in joule is consumed when 100 units electricity are used?

5 electric bulbs of 100 W are used for 8 hours, then …………… unit of energy would be consumed in 1 day. (4,5,8)

The electricity bill of Atulbhai's house is more. So Sachin advised him to go for Government's subsidy scheme and put solar panels in his house. By doing so Atulbhai's electricity bill reduces. (1) In the solar panel the solar energy is converted into what form of energy ? (2) How many watts of electricity is produced from a typical solar cell when exposed to the sum ? (3) State the limitations of solar energy.

The total energy of an electron in the first excited state of the hydrogen atom is about –3.4 eV. (a) What is the kinetic energy of the electron in this state? (b) What is the potential energy of the electron in this state? (c) Which of the answers above would change if the choice of the zero of potential energy is changed?

In a house, if three bulbs of lOOW, 60W and 40W respectively are used 2 hours per day, how many units of electrical energy will be consumed in 30 days?

Vishva noticed in a dhaba around 50 bulbs, each of 100 W all were glowing. She calculated the cost of electricity consumed in one hour and told the dhaba owner to reduce the expenses and at the same time save electricity by using CFL bulbs instead of ordinary filament-type bulbs. What would be the cost of electric energy if 50 bulbs, each of 100 W. are used for one hour? 1 unit costs Rs 5.

Dharmendra is a welder , working at Amit.s house . After electric welding done with naked eyes , he used a grinder to smoothen the welding joints . Accidentally , some particle fell into his eye . He was then crying due to pain . Amit took him to an eye hosptial by a taxi. Amit took him to an eye hospital by a taxi . The doctor used a device connected to two electric wires to remove the particle from his eye . Dharmendra inquired what happened to his eye and what device did the doctor use to remove the particle from his eye . Amit as a science students of class X explained to Dharmendra and adivsed him to be carefull in future as he had a responsible risky job of welding . Which particle fell into Dharmendra.s eye while welding ? What precautions should Dharmendra take while doing electric welding and grinding work ?

Dharmendra is a welder , working at Amit.s house . After electric welding done with naked eyes , he used a grinder to smoothen the welding joints . Accidentally , some particle fell into his eye . He was then crying due to pain . Amit took him to an eye hosptial by a taxi. Amit took him to an eye hospital by a taxi . The doctor used a device connected to two electric wires to remove the particle from his eye . Dharmendra inquired what happened to his eye and what device did the doctor use to remove the particle from his eye . Amit as a science students of class X explained to Dharmendra and adivsed him to be carefull in future as he had a responsible risky job of welding . What device was used by the doctor to remove the partcile ?