Physics - Electricity Lesson 6 : Ohm's Law
Current 1 of 8.4 A runs for 240 seconds and then stops. Current 2 is 10.5 A. How long does current 2 have to run to deliver the same amount of charge as current 1?
192 s
A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest whole number, is
192 Ω
A toy car has a 1.5 A current, and its resistance is 2 Ω. How much voltage does the car require?
3 V
How long will it take 24 C of charge to flow in a 6.0 A circuit?
4.0 s
A cell phone uses a 3.0 V battery. The circuit board it uses needs a 0.05 A current. What size resistor is needed to generate this current?
60 Ω
In 12 s, a wire delivers 96 C of charge. The current in the wire, to the nearest whole number, is
8 A
A current of 6.0 A runs through a circuit for 2.5 minutes. How much charge was delivered to this circuit?
900 C
what formula do you use to find current when time and charge are known ?
I = change in q/t
Ohm's law formulas
V=IR I = V/R R = V/I
Bruce must report any circuits that deliver more than 4.0 C of charge in 8.0 s. Which lists every circuit that Bruce must include in his report?
X and Z
Ohm's Law states that
current is equal to voltage divided by resistance
I =
current, amperes (A)
electric current and voltage relationship
direct relationship, as voltage increases, current increases
Which changes would cause an increase in the resistance of a wire?
increasing its temperature using a longer wire using a thinner wire
electric current and resistance relationship
inverse relationship, as resistance increases, current decreases
What is the tendency of a material to oppose the flow of charge?
resistance
R =
resistance, ohms Ω
what is resistance
tendency of a material to oppose the flow of charges
voltage (electric potential difference) definition
the difference in electric potential (V) between two positions
what is current (I)
the flow of electric charge
the greater the resistance,
the less current will flow
the greater the voltage,
the more current will flow
SI unit for resistance
the ohm Ω
Which factors affect the flow of electric charge? Check all that apply.
voltage resistance
If an electric circuit has 0 A of current running through it, then the
voltage must also be zero
V =
voltage, volts (V)