Advertisements
Advertisements
Questions
Give the electric current unit.
What is the SI unit of electric current.
Advertisements
Solution
The standard SI unit for current is the ampere with the symbol A.
RELATED QUESTIONS
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?
Why should the resistance of:
an ammeter be very small?
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A?
Calculate the equivalent resistance between A and B in the adjacent diagram.

The work done in moving unit positive charge across two points in an electric circuit is a measure of
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?
Complete the following table. The first answer has been given as an example
| Quantity | Unit |
|
(a) Electrical potential Volt ( b) Resistance ( c) Power ( d) Energy ( e) Resistivity |
Volt ........ .......... ............ .............. |
In a house there are 6 bulbs of 100 W each used for 4 hours a day, 4 bulbs of 60 W each used for 8 hours a day, an immersion heater of 2.5 kW used for 1 hour per day, and an electric iron of 800 W used for 2 hours per day. Calculate the cost of monthly electric bill for the month of April at the rate of 80 p per unit.
An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?
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
State expression for Cells connected in series.
Name any two devices, which are working on the heating effect of the electric current.
Electric current passes through a metallic conductor due to the movement of ______.
