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)