What is the current in the circuit shown (Fig. )
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
A potential difference of 6 V is applied across a 3 Ω resistor. What is the current flowinq throuqh the circuit?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Write the SI units for:
(a) Electric current
(b) Potential difference
(c) Charge.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Define potential difference between two points.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Define electric power. What do you mean by 'power rating' of an electric appliance?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Distinguish between electric power and electrical energy. State their units. Give the other name of kWh.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
State the S.I. units of electrical power and electrical energy.
(i) Define the household unit of electricity.
(ii) What is the voltage of the electricity that is generally supplied to a house?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Write different expressions for electric power (P), using V, I and R.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Name the commercial unit of electrical energy.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
A radio set of 60 W runs for 50 hours. How much electrical energy is consumed? Give your answer in kWh.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours every day. How much is the electric energy consumed during the month of June?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Can you produce electricity from magnetism?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Held at rest inside the coil?
(iii) Pulled out again?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
What is the frequency of D.C.?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
What is the frequency of A.C. used in India?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
A dynamo converts one from of energy into another. Name the two forms of energy.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
What is the usual colour code followed for connecting live, neutral and earth wires?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
The diagram 31 shows a 3 terminal plug socket.
(i) What is the purpose of the terminal E?
(ii) To which part of the appliance is the terminal E connected?
(iii) To which wire L or N, is the fuse connected and why?
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Tick(✓) the correct choice in the following:
In the circuit shown in the following fig, the e.m.f. of the cell is 4 volts, the current
flowing through the resistor is
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
Describe the construction and working of a filament lamp. List the material used and state why they are suitable for their purpose in this lamp.
[8] Current Electricity
Chapter: [8] Current Electricity
Concept: undefined >> undefined
