Energy and Electrical Devices

Yes, it is an example of kinetic energy.

Yes, it is correct. LED gives more light, but does not produce heat. Hence, wastage of electricty is nill or very little.

Yes, it is correct. 

Juicer works on magnetic effect of electric current and not its heating effect, like the rest of the given devices.

Lead is a key component in lead-acid storage batteries, used in cars and backup power systems. Lead plates and sulfuric acid create the electrochemical reaction. Lead is too heavy and toxic for use in fans, TVs, or bicycles.

An electric bulb converts electrical energy into light energy (and some heat energy). This is the fundamental principle of how incandescent and LED bulbs work - they transform electricity into visible light. Sound energy production would be a speaker, while mechanical energy conversion relates to motors and generators.

Gyroscopic instruments in aircraft require power to maintain their high-speed rotation. Electric systems use vacuum pumps or electric motors, while pneumatic systems use engine-driven vacuum pumps. Modern aircraft typically have both power sources available for redundancy and在不同飞行条件下的灵活性。

Torches

Yes, it's the correct choice. 

All the above options are true.

An electric motor converts electrical energy into mechanical energy through electromagnetic principles. When current flows through coils in a magnetic field, it creates rotational motion. This is the reverse of a generator's function.

An electric heater contains a heating element (resistor) that converts electrical energy into heat energy through Joule heating. Microphones convert sound energy to electrical energy, photo electric cells convert light energy to electrical energy, and electric motors convert electrical energy to mechanical energy.

A photo electric cell works on the photoelectric effect - when light strikes certain materials, electrons are ejected, creating electrical energy. Amplifiers increase signal strength, motors convert electricity to motion, and dynamos convert mechanical energy to electrical energy.

An electric motor works on the principle that a current-carrying conductor in a magnetic field experiences a force. It takes electrical energy as input and produces mechanical energy (rotational motion) as output. This is the opposite of a generator, which converts mechanical energy to electrical energy.

Q-Cells was a German company that was indeed a leader in solar cell manufacturing. Founded in 1999, Q-Cells became one of the world's largest producers of photovoltaic solar cells before filing for bankruptcy in 2012 (though the brand continues). They specialized in manufacturing solar cells and photovoltaic modules.