Advertisements
Advertisements
Question
The voltage across a 3Ω resistance is 6 V. How large is the current? What is
the resistance of a filament lamp when a voltage of 3 V across it causes a
current of 0.5 A?
Advertisements
Solution
If voltage, V = 6 volt and resistance R = 3Ω
The a/c to ohm's law, current I = `"V"/"R" = 6/3 = 2 "A"`
For filament lamp:
Given that, voltage= 3 V, current= 0.5 A.
let R be the resistance of the filament lamp;
then R = `"V"/"I" = 3/0.5` = 6Ω
APPEARS IN
RELATED QUESTIONS
The device used for measuring potential difference is known as:
Define the unit of resistance (or Define the unit "ohm").
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Define the following:
Potential difference
From the following observations taken while determining the resistance of a conductor, draw the current-voltage graph and calculate the resistance of conductor. Is the conductor ohmic?
| Ammeter reading I (in ampere) | Voltmeter reading V (in volt) |
| 0.2 | 0.4 |
| 0.3 | 0.6 |
| 0.5 | 1.0 |
| 0.8 | 1.6 |
| 1.5 | 3.0 |
The SI unit of potential difference is ______.
Assertion (A): Charges flow from higher potential to lower potential.
Reason (R): Current flows mainly due to the flow of electrons.
Inside a hollow charged spherical conductor, the potential ______
Twenty-seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
Study the following circuit and find:
- Effective resistance of the circuit
- Current drawn from the battery
- Potential difference across the 5 omega resistor
