Electricity: Class 10 Science Q&A · Page 12
281 free answers on Electricity (Science) for Class 10 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 10ICSE
Fill in the following blanks with suitable words: a) A current is a flow of …….. for this to happen there must be a ……… b) Current is measured in ……….. using an ………….placed in in a circuit.
Electrons and closed Amperes, ammeter, and series
- ScienceClass 10ICSE
What is the current in a circuit if the charge passing each point is 20C in 40s? Answer:
Given, Charge moved, Q = 20C Time taken, t = 40s To find, Current, I = ? We know that, I = Q/t Substituting the values in the above equation we get I = 20/40 = 0.5A Therefore, 0.5A is required for moving 20C charge in 40s.
- ScienceClass 10ICSE
A current of 4A flows around a circuit for 10s. How much charge flows past a point in the circuit in this time?
Given, Current, I = 4A Time taken, t = 10s To find, Charge moved, Q = ? We know that, I = Q/t Substituting the values in the above equation, we get 4 = Q/10 Q = 4×10 = 40C Therefore, 40C charge is moved in 10s when the current flowing is 4A.
- ScienceClass 10ICSE
If 20C of charge pass a point in a circuit in 1s, what current is flowing?
Given, Charge moved, Q = 20C Time taken, t = 1s To find, Current, I = ? We know that the current is calculated as follows: I = Q/t Substituting the values, we get I = 20/1 = 20A Therefore, 20A current is required to move a charge of 20C in 1s time.
- ScienceClass 10ICSE
Compare how an ammeter and a voltmeter are connected in a circuit? Answer:
In an electric circuit, ammeter is connected in series while the voltmeter is connected in parallel.
- ScienceClass 10ICSE
Which of the two is connected in series: ammeter or voltmeter?
Out of ammeter and voltmeter, ammeter is connected in series.
- ScienceClass 10ICSE
How many milliamperes are there in 1 ampere? b) How many microamperes are there in 1 ampere?
Following is the milliamperes that are there in 1 ampere: 1 amp = 103 milliamp Following is the microamperes that are there in 1 ampere: 1 amp = 106 micro amp
- ScienceClass 10ICSE
What is the unit of electric current?
The unit of electric current is ampere.
- ScienceClass 10ICSE
Which of the following equations shows the correct relationship between electrical units? 1A = 1C/sor 1C = 1A/s
The correct is 1A = 1C/s
- ScienceClass 10ICSE
In which direction does conventional current flow around a circuit? b) In which direction do electrons flow?
The flow of conventional current takes place from the positive terminal of the batter to the negative terminal in the outer circuit. The direction in which electrons flow is from the negative terminal to the positive terminal in the The flow of electrons is usually in the opposite direction of the conventional current.
- ScienceClass 10ICSE
Which particles constitute the electric current in a metallic conductor?
Electrons are the particles that constitute the electric current in a metallic conductor.
- ScienceClass 10ICSE
What actually travels through the wires when you switch on a light?
There is a flow of electrons in the wires when the light is switched on.
- ScienceClass 10ICSE
What is the flow of charge called?
The flow of charge is called as an electric current. Electric current is defined as the rate of flow of negative charges in the conductor. Or it can also be defined as the continuous flow of electrons in an electric circuit.
- ScienceClass 10ICSE
By what name is the physical quantity coulomb/second called?
Ampere is the name that is used for the physical quantity coulomb/second. It is defined as the elementary charge e with a value of 1.602 × 10-19 is expressed in unit C which is equal to A.s
- ScienceClass 10ICSE
he atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but the rubber does not conduct electricity?
The atoms of copper contain electrons and the atoms of rubber also contain electrons but copper conducts electricity while rubber doesn’t conduct electricity because copper has free electrons that are held loosely to each other by the nuclei of the atom. These freely available electrons are responsible for the conduction of electricity in copper. Whereas in rubber the electrons are under a strong influence of the nuclei of the atoms. There are no much free electrons available fo
- ScienceClass 10ICSE
Three 2V cells are connected in series and used as battery in a circuit. a) What is the p.d at the terminals of the battery? How many joules of electric energy does 1C gain on passing through one cell and all the three cells?
When three cells with 2 volts respectively are connected in series for the construction of the battery, then the total potential difference between the terminals of the battery will be 6V. For one cell: Given, Potential difference = 2V Charge moved = 1C Work done = ? We know that work done is given as: Work done = potential difference × charge moved = 2 × 1 = 2J Therefore, work done to move a c
- ScienceClass 10ICSE
One coulomb charge is equivalent to the charge obtained in: a) 2.6×1019 electrons b) 6.2×1019 electrons c) 2.65×1018 electrons 6.25×1018 electrons
The correct option is d) 6.25×1018 electrons There are 6.25×1018 electrons in one coulomb charge.
- ScienceClass 10ICSE
The unit for measuring potential difference is: a) Watt b) Ohm c) Volt kWh
The correct option is c) Volt Volt is the unit used for measuring the potential difference.
- ScienceClass 10ICSE
Which of the following units could be used to measure electric charge? a) Ampere b) Joule c) Volt Coulomb
The correct option d) Coulomb Coulomb is the unit that is used for measuring electric charge.
- ScienceClass 10ICSE
The device used for measuring potential difference is known as: a) Potentiometer b) Ammeter c) Galvanometer Voltmeter
The correct option is d) Voltmeter Voltmeter is the device that is used for measuring potential difference.