Advertisements
Advertisements
Question
A student made an electric circuit shown here to measure the current through two lamps.
Are the lamps in series or parallel?
(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram.

Advertisements
Solution
(a) The lamps are connected in series.
(b) The student has connected the ammeter in parallel with the lamps. It should be connected in series.
(c) The correct diagram that shows how to connect the circuit:

APPEARS IN
RELATED QUESTIONS
Draw the electrical symbols of the following components and state its use:
Rheostat (variable resistance)
In 10 s, a charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit as a result.
- What is the p.d. across the battery?
- What current flows from the battery?
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
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?
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?
Name two effects produced by electric current.
Calculate the equivalent resistance between A and B in the adjacent diagram.

State the relation between work, charge and potential difference for an electric circuit.
A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
Define the following:
Super conductors
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
Name the principle on which a transformer works.
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
Find the odd one out.
Loudspeaker, Bar magnet/magnet, Electric motor, Microphone.
Common sources of Alternating Current (AC) are:
