Can you tell us Ohm’s equation?
V=I*R
What is the difference between DC and AC current?
DC is direct current goes in one direction.
AC is alternating current- it goes back and fourth
What equation do you use to find resistance?
Resistance= Voltage/ Current (I)
How many volts are delivered to your home in North America?
120V
If you plug an electric toaster rated at 110V into a 220- V outlet, current in the toaster will be
twice what it should be
The current through a 5 ohm resistor connected to a 150 V power supply is
30 Amps
Power= Current (I) X Voltage (V)
What is the frequency of AC in North America?
60 hertz or 60 cycles per second
How do you measure potential difference?
voltage (volts)
In order of there to be a flow of charge from one place to another, there must be a
-potential difference between two places
-conductor, such as a wire, connecting the two places
What flows through a circuit?
Current flows through a circuit.
Current is the flow of electrons
How is Power measured?
Watts
Give and example of something that uses DC current and an example of something that uses AC current
DC - battery or anything with a rechargeable battery
AC- kitchen appliances, TV anything that has to be plugged in etc
When a 10 V battery is connected to a resistor, 2 A current flows in the resistor. What is the resistor's value?
5 ohms
How much power is used by a 6 V flashlight battery that draws 1.5 A of current?
9 Watts of Power
Materials through which charges do not move easily
Insulators