What will be the power consumed by a 25 Ω wire if it is put across a mains of 250 volts?
Answer: A wire is generally assumed to have no resistance. But if you mean a device or resistor of 25 ohms then the answer is 2500 watts.
How do you calculate current flow in a kettle?
P=IV, here, I is the current that will flow when the kettle is turned on, V is the electrical supply voltage. Then, we get: I=P/V=(2∙〖10〗^3 W)/(230 V)=8.7 A.
What is the resistance of a kettle?
The heating element of an electric kettle, designed to have a power of about 1 kW when connected to a 230 V mains supply, has a resistance of about 50 Ω.
What is the resistance of an electric kettle?
52.9 Ω
∴ Effective resistance of its element (R) = V2P = 230×2301000 = 52.9 Ω
How do you calculate power resistance?
For example if the power is 100 watts and the voltage is 50 volts, the current is 100 / 50, or 2 amps. Calculate the resistance, in Ohms, by dividing the voltage by the current. Ohms law states that voltage = current x resistance, so by rearranging the formula resistance = voltage / current.
How much current is passed through a resistance of 300 ohms?
1. A current of 1 ampere passed through a resistance of 300 ohms 2. A current of 2 amperes passed through a resistance of 100 ohms. 15. Electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find he energy consumed and the current drawn. 16. In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours every day.
How long does an electric kettle work on 220 volts?
Electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find he energy consumed and the current drawn. 16. In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours every day. Calculate the electric energy consumed in 30 days.
How many ohms are in a 2 ampere current?
(a) A current of 1 ampere passed through a resistance of 300 ohms (b) A current of 2 amperes passed through a resistance of 100 ohms. 15. Electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find he energy consumed and the current drawn.
How many joules of heat is produced from a 4 ohm resistor?
A resistance of 25 ohm is connected to a 12 V battery. Calculate the heat energy in joules generated per minute. 6. 100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor? 7. An electric iron is connected to the mains power supply of 220 V.