Why is there a limit of voltage?

Because their components are only designed to be able to work within a certain voltage range. Higher voltages could arc across circuit elements or burn out components. Design limits.

Why do electronics use low voltage?

For example, using low voltage electrical devices lowers costs and increases safety. Low voltage electrical supply also improves energy efficiency. Most sources of renewable energy, including solar, hydro, and wind all provide low direct current power.

Why do some devices need higher voltage?

Why do some things require bigger current and bigger voltages? Since the product of voltage and current is power, the more power that is converted, the larger the product of voltage and current required of the power supply. In many cases, the electrical power is converted to heat due to losses.

Why does voltage decrease when load increases?

Originally Answered: why is voltage drop when the load increase? When load current increases, the voltage drop across internal impedance (resistance in DC circuits) increases so now lesser output voltage is available at terminals.

Why is a transistor low power device?

So 99.999\% of transistors are used in applications needing very low power, such as the many millions of transistors on a single CPU. Each transistors needs very little power to do it purpose so they are very small and not needing to be higher power devices.

What are low voltage electronics?

Low voltage systems are comprised of electrical equipment that uses 50 volts (V) of electricity or less. Common low voltages include 48 V, 24 V, and 12 V. Residential examples of low voltage systems include doorbells, garage door openers, home security sensors, thermostats, and landscape lighting.

Why are low voltages neccessary in electronic circuits?

Low voltages are neccessary in the electronic circuits because we usually play with the size of the device. Electronic devices need to get smaller and smaller. Think of it, more voltage means more power. More power means more power consumption else dissipation. Which means heat!

Why do microcontrollers work on lower voltage with lower current levels?

One of the advantages of using low voltage for electronic devices is that they carry lesser current it means it requires wires of lower size which would be very convenient for making devices smaller. That is the reason why microcontroller work on lower voltage with lower current levels.

What is the difference between voltage rating and current rating?

The voltage rating is the specified maximum voltage it can safely switch. (Higher voltages require larger contact separation.) The current rating is the maximum current it can handle. This needs to accommodate both the continuous current through the switch when closed and any arcing during opening.)

Is a 5V 1A power supply bad for a switch?

A 5V 1A supply isn’t likely to do anything serious (though the life of the switch may be reduced), but this is why switches have current and voltage ratings: