Units
Can you tell us Ohm’s equation?
V=I x R
When resistance is increased in a circuit, for example by adding more electrical components, the current ______________ as a result.
Decreases
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
Elements with high conductivity, which have very mobile electrons are called...? (Copper is an example.)
Conductors
What equation do you use to find resistance?
Resistance= Voltage/ Current
The resistance of a long wire is ___________ than the resistance of a short wire
Greater
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)
During a severe thunderstorm a large static discharge known as ______________ may occur.
What is lightning?
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