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If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current? - Science and Technology

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प्रश्न

If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?

बेरीज
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उत्तर

The current flowing through the conducting wire is

`"I" = "Charge (Q)"/"Time (t)"`

⇒ `"I" = 420/(5 xx 60) = 1.4  "A"`

Hence, the current flowing through the wire is 1.4 A.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Current Electricity - Exercise [पृष्ठ ४५]

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बालभारती Science and Technology [English] 9 Standard Maharashtra State Board
पाठ 3 Current Electricity
Exercise | Q 9. C. | पृष्ठ ४५

संबंधित प्रश्‍न

The SI unit of charge is volt.


If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is:

(a) 30 A
(b) 0.3 A
(c) 0.5 A
(d) 5 A


State the factors on which the strength of electric current flowing in a given conductor depends.


The p.d. across a 3 Ω resistor is 6 V. The current flowing in the resistor will be:

(a) `1/2A`
(b) 1 A
(c) 2 A
(d) 6 A


V1, V2 and V3 are the p.ds. across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5 A.  

Which one of the columns (a) to (d) shows the correct values of V1, V2 and V3measured in volts? 

           `V_1`   `V_2`  `V_3` 

(a)         1.0       2.0        3.0                    

(b)         5.0       10.0      15.0

(c)         5.0       2.5        1.6                 

(d)         4.0       4.0        2.0 


Three resistors of 6.0 𝛀, 2.0𝛀 and 4.0𝛀 are joined to an ammeter A and a cell of e.m.f. 6.0 V as
shown in fig 8.52 Calculate:
(a) the effective resistance of the circuit and
(b) the reading of ammeter. 

 


A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.


Explain briefly how a fuse protects an electric circuit.

Tick(✓) the correct choice in the following:

When the length of a conductor is doubled the resistance of the conductor
will


Define the following:

Super conductors


A current of 0.3 A is flowing through a branch of 6 Ω resistors in a junction as shown in fig. . Calculate the
(a) P.d. across the junction XY,
(b) Current flowing through 9Ω and 24Ω
( c) P.d. across 24 Ω resistor, and
( d) e.m.f. of the cell.


Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.


Tick (✓) the correct choice among the following :

Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :

The total current taken from the supply


What should I choose ___________________

a. for decreasing resistance in a circuit.
(Resistors in series / Resistors in parallel)

b. for getting protection from electric current.
(Nickel / Ebonite)

c. to measure the current in the circuit?
(Ammeter/ Voltmeter) 

Answer the following question.
What is the function of a galvanometer in a circuit?


Study the following circuit and find out:
      (i) Current in 12 Ω resistor.
      (ii) The difference in the readings of A1 and A2, if any.


True or False – If False give the correct answer

The representation of the electric current is A


Conventionally, the direction of the current is taken as:


Unit of electric power may also be expressed as


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