electric current 1
a flow of charged particles in a conductor due to potential difference is called :
electric current
An ammeter measures the _________ in a circuit
current
A __________ is a material with zero resistance.
superconductor
the direction of the flow of positive charges in a conductor due to potential difference between it's ends
conventional current
Which of the following is the unit for potential difference?
a. Ampere
b. Joule
c. Ohms
d. Volt
d. Volt
The schematic on the right is an example of a _________ circuit
parallel circuit
when produced energy is transmitted through transmission lines, what parameter is responsible for power losses in the cables and needs to be reduced?
the current
______: The measure of how strongly an object or a material impedes current produced by a potential difference
resistance
Any closed loop or conducting path allowing electric charges to flow is called an ______
electric circuit
A lamp changes __________ energy into ___________ energy and _____________ energy.
electrical , radiant , thermal
An electric heater uses 9 kWh per day at a cost of 0.4 AED per kWh. How much does it cost to run the electric heater for 5 days?
18 AED
name the following component
potentiometer
What is the current through an 80 W lightbulb that is connected to a 130 V outlet?
0.61 A
A heater has a resistor of 15 Ω. It operates on 120 V. What is the power of the heater?
960 w
. A kilowatt-hour is equivalent to ______________.
3.6×106 J
the current in a circuit can be controlled in 2 ways :
1.
2.
changing the voltage
changing the resistance
An 8.0 V battery delivers 0.5 A current to an electric motor connected across its terminals. What power is delivered to the motor?
4 w
A 40 V battery is connected to a 10 Ω resistor. Determine the current in the circuit?
4 A
a 50 w light bulb is 80% efficient. this means that 80% of the electrical energy supplied to it is transformed into radiant energy.
how many joules does the light bulb transform into radiant energy each minute it is in operation ?
2400 J
what are the factors effecting the resistance of a material ?
1.
2.
3.
4.
length , area , temperature , material