Electric Current
Electric Circuit. voltage
Electrical Resistance
Resistivity
Random
100
he directed motion of charged particles in a circuit is called _______
electric current
100
What is an electric circuit?
An electric circuit is a connection of electric elements (such as a battery, bulb, switch, and wires) that allows electric current to flow.
100
When electrons move through conductor, they hit the atoms of the conductor. The conductor resists the motion of electrons. This is called ____ ____.
Electrical resistance
100
Is it difficult for an electron to go through a short wire or long wire?
Long
100
All electric devices need an ____ ____ to work
electric current
200
Which materials are good conductors of electricity?
Good conductors allow electric current to pass through them easily. Examples include gold, copper, silver, and mercury.
200
Why do we use symbols to represent electric elements?
Symbols make it simpler and faster to draw circuit diagrams instead of drawing the real elements.
200
The formula of Ohm's Law
I=U/R
200
Why does the resistance depend on the type of material?
Materials have different atomic structures, therefore they have different conducting abilities
200
What does voltage do?
pushes electrons
300
What charge does pass through 3 Ampere lamp in 10 seconds?
30 Coulomb
300
What is the difference between voltage and current?
Voltage is the "electric energy" that pushes electrons through a circuit, while current is the flow of electrons through the circuit.
300
Electrical components which provide resistance are called __.
resistors
300
What is the best conductor?
silver
300
Electric current is similar to the ___ ____ in pipes
water flow
400
A charge of 100 Coulomb passes through a wire in 500 seconds. Calculate the current.
0.2 Ampere
400
Why is a circuit diagram compared to a "map"?
A circuit diagram is like a "map" because it shows how different electric elements are connected to create a working electric device.
400
The tourist turns on the flashlight, which has a light bulb with a resistance of R = 6 ohms. The battery voltage of the flashlight is U=9. Find the strength of the current I flowing through the bulb.
1.5 A
400
The copper wire has a length of L = 5 m and a cross-sectional area of S = 1 mm^2. The resistivity of copper is 1.68⋅10^(-8) ohms/m. Find the resistance of the wire.
0.084 Ohms
400
The robot vacuum cleaner is powered by a battery with a voltage of U=24 V. The resistance of the robot motor is R=8 ohms.
a) What current does the motor consume?
3A
500
some materials do not allow electric current to pass through them. They are called
Insulator
500
Draw an electric circuit diagram of these pictures
500
The kettle is powered by a mains voltage of U = 220 V. Its heating element has a resistance of R = 44 ohms. How many kettles with the same current can be connected simultaneously to one network with a maximum current of 10 A?
2
500
The resistance of a copper wire with a length of L = 10 m and a cross section of S = 2 mm ^ 2 is equal to R = 0.084 ohms.
a) How will the resistance change if you double the length of the wire and reduce the cross section 0.5 times?
The resistance has increased by 4 times.
500
The heating element is made of nichrome wire with a length of L = 2 m and a cross-sectional area of S = 0.5 mm^2. The specific resistance of nichrome is p=1.10⋅10-6 ohms/m.
a) Find the resistance of the wire.
4,4 ohms