Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits
Frank Textbook Solutions Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits
Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 10 Physics exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits for the Frank textbook.
Frank Textbook Solutions for class 10 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 10 Physics will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 10 students can refer to our solutions while doing their homework and while preparing for the exam.
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits Page/Excercise 201
Electrical power is defined as the rate at which energy is changed or work is done i.e., the work done per second or energy converted per second.
Electrical appliances come with certain number of watts and volts written on them. Power rating of an electrical appliance gives the knowledge of the safe current limit of an appliance and also indicates the voltage above which the appliance should not be used.
'The current rating of a fuse is 5 A' means that the maximum safe current permitted to flow through it before it breaks down is 5A.
An electric fuse is a safety device which is used to limit the current in an electric circuit. The use of a fuse thus safeguards the circuit and appliances connected in that circuit from being damaged.
A fuse is generally made of an alloy of lead and tin.
Characteristics of fuse wire:
(i) It should have low melting point.
(ii) It should have high resistance.
(i) resistance, melting point
(ii) low, lead, tin, melts.
(iii) series, live
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits Page/Excercise 202
The main fuse is connected between the kWh meter and distribution board of the house circuit. The main fuse is connected in the live wire.
Yes, kWh is the unit of electrical energy.
A switch is an on-off device for current in a circuit (or in an appliance). Its main function is either to connect or to disconnect an electrical appliance in an electric circuit.
Switches are always connected in the live wire of circuits so that when a switch is in 'off' position, no current flows through the appliance and its live and neutral wires are at same potential and it is safe to touch the live wire leading to the appliance, even when the fuse is blown.
A switch should not be touched with wet hands. This is because water forms a conducting layer between the hand and the live wire of the switch through which the current passes to the hand and we may get a fatal shock.
The metal case of an electrical appliance is earthed so that in any case of accidental contact of live wire with the metallic body of the appliance, the earthing would provide a safe and easy path for the electric charges to flow down to the earth which acts as very large sink. Thus, user is thereby protected from any fatal electric shock.
International convention of colour coding:
1. Live wire - Brown
2. Neutral wire - Light blue
3. Earth wire - Green or yellow
The fuse helps to control the maximum current in an electrical circuit. The fuse protects an electrical circuit by melting and breaking the circuit, whenever the current exceeds the pre-determined limit in the circuit. Due to low melting point, the fuse wire melts and then breaks the circuit.
Earthing is done to save an electrical circuit or an appliance from damage. If due to some reason such as short circuiting, an excessive current flows through the line wires, it will pass to the earth if there is local earthing, otherwise it may cause a fire due to overheating of line wires.
One may get an electric shock from an electrical appliance if accidentally the live wire comes in contact with the metallic case of the body of the appliance due to break of insulation after constant use (or otherwise).
The SI unit of electrical energy is joule.
The SI unit of electrical power is watt.
(i) Kilowatt-hour is the household unit of electrical energy. It is defined as the quantity of electrical energy consumed in 1 hour when the rate of consumption is 1000 watts, i.e. 1000 J/s.
(ii) A voltage of 220 volt is generally supplied to a house.
A three pin-plug has three terminals:
(i) Earth pin: It provides connection for earthing.
(ii) Neutral pin: It provides connection to the neutral wire.
(iii) live pin: It provides connection to the live wire.
Consumer pays the bill in kilowatt-hour.
Kilowatt-hour is the commercial unit of electricity.
Power-voltage rating of an electrical appliance indicates the value of voltage above which the appliance should not be used. It serves as a precaution to the customer and also helps to calculate the maximum value of current that can be safely passed through the appliance.
The physical quantity is electric power.
It means that if the bulb is lighted on a 200V supply it consumes 60W electrical power or 200J of electrical energy converts into heat and light in 1 second.
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 4 - Current Electricity - Electrical Power and Household Circuits Page/Excercise 203
Watt-hour is the commercial unit of electrical energy.
One watt-hour is the electrical energy consumed by an electrical appliance of power 1 watt when it is used for 1 hour.
1Wh = 3600 J
Kilowatt-hour is the commercial unit of electricity.
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