Electric Circuits Answers

Why tapping on floor by foot produces sound
Does the floor vibrate which cannot be seen

An electric kettle is rated at 2kW when connected to a 230V electrical supply.
a) Calculate the current that will flow when the kettle is turned on.
b) What fuse should be included in the circuit of the kettle? Assume that the fuses available are 3A, 5A,
and 13A.
c) Calculate the resistance of the heating element of the kettle.
d) If 420kJ of energy are required to boil some amount of water, how much time would the kettle need
to boil this amount of water?

How electrons produced at zinc electrode i.e anode in a dry cell move through wire and produce electricity
Do they move through wire or directly through electrolyte to cathode

A microwave oven of unknown resistance is connected to a 110V voltage source.calculate the oven’s resistance if the current needed has an intensity of 7,200mA

two objects exert a force of 4.2 N on each other. The distance between the objects is 0.36 m. The charge on one object is 2.8x10^-9 C. What is the charge on the second object?

An electric toaster consumes 1875 W in operation. Assuming it is plugged into a 125 V source, what current flows in the circuit?

A filament lamp is placed with a resistor of 150 ohms as shown in the circuit below and then connected to a cell of potential difference 12 volts . The current leaving the cell is 0.1A

Calculate the resistance of the filament lamp

What is the velocity of a wave if it’s wavelength is 2.4m and its period is 12 seconds?

Two fixed point charges +4e and +e units are seperated by a distance a where should the third charge be placed for it to be in equilibrium

Calculate the resistance of 1km long copper wire of radius 1mm