Fill in the blank: The SI unit of power is ___ and it is equivalent to one joule per second.

Watt

True or False: One kilowatt is equal to 1000 watts.

True

Using Ohm's law, express power in terms of current and resistance.

Power can be expressed as P = I^2R, where P is power in watts, I is current in amperes, and R is resistance in ohms.

What is the relationship between power, current, and potential difference in an electrical circuit?

The relationship is given by the formula P = VI, where P is power in watts, V is the potential difference in volts, and I is the current in amperes.

Fill in the blank: When a current of 1 ampere flows through a circuit with a potential difference of 1 volt, it consumes ___ watt.

1

True or False: A megawatt is equal to 10^6 watts.

True

Fill in the blank: One kilowatt hour is equivalent to ___ joules.

3.6 x 10^6 J

True or False: The electricity bill reflects the amount of energy consumed needed to keep the electrons flowing in the circuit.

True

How is the resistance of the filament of a bulb calculated when it is glowing?

The resistance of the filament of the bulb is calculated using the formula R = V^2/P.

Fill in the blank: The safe limit of the current through the filament of the bulb can be calculated using the formula I = ___ / V.

P (Power rating on appliance)

The electrical energy consumed by an appliance can be calculated as Energy in kWh = Power in kW x time in h. If power is given in watts, the formula becomes ___ .

Energy in kWh = (Power in W x time in h) / 1000

True or False: The amount of heat produced in a wire decreases with an increase in current.

False. The amount of heat produced increases with an increase in current, as H ∝ I^2.

Fill in the blank: The cost of electricity is determined by multiplying the energy consumed in kWh by the ___ .

Rate per kWh

If an appliance uses 2000 W of power for 3 hours, how much energy does it consume in kWh?

Energy = (2000 W x 3 h) / 1000 = 6 kWh.