Advertisements
Advertisements
Question
Which of the following represents voltage?
Options
`("Work done")/("Current" xx "Time")`
Work done × Charge
`("Work done" xx "Time")/"Current"`
Work done × Charge × Time
Advertisements
Solution
`("Work done")/("Current" xx "Time")`
Explanation -
Potential difference (V) is defined as the ratio of work done (W) and charge (Q).
`"V" = "W"/"Q"`
Q = i × t
Charge is defined as
Q = i × t
where i = current
t = time
So,
`"V" = "W"/("i" xx "t")`
`"Voltage" = ("Work done")/("Current" xx "Time")`
APPEARS IN
RELATED QUESTIONS
Which of the following equation shows the correct relationship between electrical unit?
1A = 1C/s or 1c= 1A/s
How many milliamperes as there in 1 ampere?
Which of the two is connected in series : ammeter or voltmeter?
Fill in the folloing blank with suitable words:
A current is a flow of ............... .For this to happen there must be a ............... circuit.
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
State the factors on which the strength of electric current flowing in a given conductor depends.
Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:
(b) for lighting inside the rooms of the hotel?
If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?
Distinguish between an open and a closed circuit.
A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
Two cells each having an e.m.f. of 2 V and an internal resistance of 2Ω are
connected (a) In series, and ( b) In para 1le l as shown in fig. . What is the
current flowing through the cir cu it in each_ case?
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?
A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The resistance of the bulb
- What is meant by electric current?
- Name and define its unit.
- Which instrument is used to measure the electric current? How should it be connected in a circuit?
For current to flow, one needs art open circuit.
What does the direction of current convey?
