Advertisements
Advertisements
Question
How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?
Advertisements
Solution
Heat produced by a current passing through a wire with a fixed resistance depends on the square of current, I.
Heat, H = I2 x R x t
APPEARS IN
RELATED QUESTIONS
What does an electric circuit mean?
A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time?
Fill in the folloing blank with suitable words:
Current is measured in ............... using an ............... placed in ............... in a circuit.
What Makes an Electric Current Flow in a Wire?
In 10 s, charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit a result.
What current flows from the battery?
Which unit could be used to measure current?
(a) Watt
(b) Coulomb
(c) Volt
(d) Ampere
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:
(a) for decorating a hotel building from outside?
Two resistors of 2.0 Ω and 3.0 Ω are connected (a) in series (b) in parallel, with a battery of 6.0 V and negligible internal resistance. For each case draw a circuit diagram and calculate the current through the battery.
Tick(✓) the correct choice in the following:
Which of the following quantities has the same value for all electrical
appliances connected to the ring main circuit in a house?
A 3 pin mains plug is fitted to the lead for a 1 kW electric kettle to be used on a 250 V A.C. supply. Which of the following statements is NOT correct?
(a) A 13 A fuse is the most appropriate value to use.
(b) The brown wire should be connected to the live side of the mains.
Name the principle on which a transformer works.
Two electric bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric mains of 220 V. Find the current drawn by the bulbs from the mains.
State expression for Cells connected in series.
What determines the direction of flow of electrons between two charged conductors kept in contact?
Kilowatt hour is the unit of
Coulomb is the SI unit of ____________.
