a) When transmitting electrical energy, heat is released in the wires. During long-term, stationary operation of the electric circuit, a thermal balance is established between the release of heat as a result of electric heating and the removal of heat to the environment (air). In the coil, the heat removal condition is bad (the outer surface area of a coil is much smaller than the surface area of the deployed wire). Therefore, the coiled wires are always cooled worse and their temperature in stationary mode is higher than the same wire deployed in any way.
b) The force of interaction of a direct current with a magnetic field is constant (does not change in time) so the wire bends in the direction of the action of this force and we notice this bend. In the case of alternating current, the force of the wire's interaction with the magnetic field is variable and we may not notice the bending and oscillation of the wires.
с) The maximum power in the AC circuit can be written in the form "W=U\\cdot I" in which "U" and "I" - the Root Mean Square (RMS) values. For the case of a normal circuit of 220 V and a current limit of 10 A, the maximum power of the circuit is 2200 W. Therefore, you can turn on no more than one device with the 2000 W power. No devices can be connected to a circuit with a voltage of 127 V.
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