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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?
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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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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
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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.
Tick(✓) the correct choice in the following:
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(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.
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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 ___________________
b. for getting protection from electric current.
c. to measure the current in the circuit?
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
