Doubtly
@Doubtly · Joined Feb 2021
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- Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V Given Charge, Q = 96000C Time, t= 1hr = 60 x 60= 3600s Potential difference, V= 50volts Now we know that H= VIt So we have to calculate I fi... 1
- Why does the cord of an electric heater not glow while the heating element does? The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element, it b... 1
- What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance There are four coils of resistances 4 Ω, 8 Ω, 12 Ω and 24 Ω respectively. (a) If these coils are connected in series, then the equivalent re... 1
- How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω? https://youtu.be/4fV86enlX04 2
- What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in seri There is no division of voltage among the appliances when connected in parallel. The potential difference across each appliance is equal to... 1
- An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected https://youtu.be/MyGgXsAxodg 2
- Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and (a) When 1 Ω and 10⁶ Ω are connected in parallel: Let R be the equivalent resistance. therefore 1/R = 1/1+1/10⁶ \\ R=10⁶/1+10⁶ simeq 10⁶/10⁶... 1
- Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to An ammeter should be connected in the circuit in series with the resistors. To measure the potential difference across the resistor it shoul... 1
- Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor Three cells of potential 2 V, each connected in series therefore the potential difference of the battery will be 2 V + 2 V + 2 V = 6V. The f... 1
- Use the data in Table 12.2 to answer the following - Table 12.2 Electrical resistivity of some substances at 20°C (a) Resistivity of iron = 10.0 x 10⁻⁸ Ω Resistivity of mercury = 94.0 x 10⁻⁸ Ω Resistivity of mercury is more than that of iron. This implie... 1
- Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal? The resistivity of an alloy is higher than the pure metal. Moreover, at high temperatures, the alloys do not melt readily. Hence, the coils... 1
- Let the resistance of an electrical component remains constant while the potential difference across According to Ohm’s law V = IR ⇒ I=V/R ... (1) Now Potential difference is decreased to half ∴ New potential difference Vʹ=V/2 Resistance rem... 1
- Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the The current will flow more easily through thick wire. It is because the resistance of a conductor is inversely proportional to its area of c... 1
- On what factors does the resistance of a conductor depend? The resistance of a conductor depends upon the following factors: Length of the conductor Cross-sectional area of the conductor Material of... 1
- How much energy is given to each coulomb of charge passing through a 6 V battery? The energy given to each coulomb of charge is equal to the amount of work which is done in moving it. Now we know that, Potential difference... 1
- What is meant by saying that the potential difference between two points is 1 V? If 1 J of work is required to move a charge of amount 1 C from one point to another, then it is said that the potential difference between t... 1
- Name a device that helps to maintain a potential difference across a conductor. Any source of electricity like battery, cell, power supply, etc. helps to maintain a potential difference across a conductor. 1
- Calculate the number of electrons constituting one coulomb of charge. One electron possesses a charge of 1.6 ×10⁻¹⁹C, i.e., 1.6 ×10⁻¹⁹C of charge is contained in 1 electron. ∴ 1 C of charge is contained in 1/1.... 1