Current
Draw the direction of Current
From "positive" terminal to "negative terminal"
What's voltage
Voltage is work done by charge.
What do we use to prevent burning out electronics?
Fuse
What's Power? Write formula of the Electric Power
Power is amount of work done in unit time / P=UI
A small electric Heater takes a Power of 60W from a 12V power supply
What's the current in the Heater?
5 amperes
What's the current?
Current is movement of charged particles
What will happen to the Resistance if we will increase diameter of the wire?
Resistance and Area are inversely proportional to each other, that's why resistance will decrease
Why usually in home Lamps are connected in Parallel?
Because it more practical way.
Unit and Formula of the Work?
Joule / W=IUt
A small electric Heater takes a Power of 60W from a 12V power supply
What is the resistance of the heater?
0.41 Ampere
On what depends current?
Voltage and Resistance of the wire
What will be final resistance for two resistance of 4 ohm connected in paralle, draw also circuit for this cituation
Answer is only accepted with question answered fully
2 ohm
Explain meaning of this terms "a.c only" and "50 Hz"
Alternating current and Frequency of this current
Calculate Power of the Televison with Voltage 220 Volts and Current 1A. State unit.
Only full answer is acceptable
220 Watts
A small electric Heater takes a Power of 60W from a 12V power supply
How much charge in (Coulomb) passes through the heater in 20sec?
20mC
Citcuit will be drawn. Show on the circuit how you are gonna measure current in Lamp?Also name the divice(Answer is not acceptable without "device")
Device name is "Ampermeter" it has to be connected in serial
Look at the Q3. What will happen to the current through L1 if we connect in serial same amount of batteries?
Current will be also doubled.Because Voltage and Current directly proportional
When one of the lamps on the string of lights breaks other go out as well.What does this tell you about the way lamps are connected?
It means that Lamps are connected in Series
In 5 second Hairdryer receives 10 000 Joule of energy from supply. What is Power transfered in Watts and KiloWatts?
Only full answer is acceptable
5 000 watts
5 kWatts
A small electric Heater takes a Power of 60W from a 12V power supply
How much energy is transfered by the heater in 20sec
1 200 Joule
State current that flows in "C" lamp (Question 4, figure)
Because all lamps are the same. Resistance will be the same.Lamp "C" has double resistance so that's why current will decrease by double. Also 2-1=1 answer accepted
What will be reading of the voltmeter (Question 6)
Reading will be 0.8 volt
Give two advantages connecting Lamps in parallel?
1. If one goes off other one will be still working
2. Less Power will be used
Derive Power formula
p = w/t
Congrats Easy 500 points
Lets Go 500 points