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Ohm's Law

An electrical...

Question

An electrical appliance has a resistance of $25 Ω$ when this electrical appliance is connected to a 230 V supply line, the current passing through it will be:

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Solution

Applying Ohm's Law

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Q. An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:

(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A

Q. An electrical appliance has a resistance of 4 ohms. When it is connected to a 12 V battery, the number of coulombs passing through it per second is

Q. When connected to the 220V mains supply, the current in a toaster, a kettle, a lamp and a fan is 5.2A, 9.4A, 0.5A and 2.6A respectively. Which appliance has the greatest electrical resistance?

Q. The table below shows the current in three different electrical appliances when connected to the 240 V mains supply:

Appliance	Current
Kettle	08.5 A
Lamp	0.4 A
Toaster	4.8 A

(a) Which appliance has the greatest electrical resistance? How does the data show this?
(b) The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and natural wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
(c) Calculate the power rating of the kettle when it is operated from the 240 V mains supply.
(d) A main takes the kettle abroad where the mains supply is 120 V. What is the current is the kettle when it is operated from the 120 V supply?

Q. Two electrical appliances are connected in parallel to a constant voltage supply. If the current in one appliance is

1 %

less than that in the second appliance, then the power of the first appliance will be less by

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