Advertisements
Advertisements
Question
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
Solution
I = 0.5 A, V = 3.0 V
Resistance of filament of the bulb R = `"V"/"I" = 3.0/0.5 = 6 Omega`
APPEARS IN
RELATED QUESTIONS
Name a device that helps to maintain a potential difference across a conductor.
State the relation between potential difference, work done and charge moved.
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 1 C passes through it?
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: a current of 2 A flows through it for 10 s?
Name the law which relates the current in a conductor to the potential difference across its ends.
The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron?
For the circuit shown in the diagram below:
What is the value of:
(i) current through 6 Ω resistor?
(ii) potential difference across 12 Ω resistor?
The SI unit of potential difference is ______.
A negative charge will move from ______ to ______ potential.
Electric potential is a measure of the ______ on the unit positive charge to bring it to that point against all electrical forces.