Equations
What is the equation for Voltage?
Current Times Resistance equals Voltage
What is a Circuit?
a pathway for electrons
What is an open circuit?
Where electrons cannot flow and cannot complete the path
What is the Unit for Voltage?
V
What is the current in the 24 Ω heating coil of this coffee maker that is plugged into a 120 V Outlet?
5 A
What is the equation for Current?
Voltage Divided by Resistance equals Current
What is Resistance?
opposes the flow of electrons measured in Ohms (Ω)
What is a Closed-circuit?
Where electrons can flow and complete the path from the negative to the positive
What is the Unit for Current?
A
In a circuit, there is one resistor with a resistance of 16.82. How much voltage is needed in order for the circuit to have a current of 14.93?
251.12
Acceptable answers...
- 251.1226
- 251.123
- 251.1
- 251
What is the equation for Resistance?
Voltage divided by Current equals Resistance
What is Electricity?
Electricity is the flow of electrons (electric charge)
What is a Series circuit?
- current travels in a single path
- one break stops the flow of current
- current is the same throughout the circuit
- lights are equal brightness
R or Ohms or Ω
How much resistance allows a 9 V battery to produce a current of 0.007 A?
1285.7 R
What is the equation for Power?
Current times Voltage equals Power
What is Potential Difference?
the “push” that causes electrons to move from - to + measured in voltage (V)
What is a Parallel circuit?
- current travels in multiple paths
- one break does not stop the flow
What is Electric current?
Electric current is the net movement of electric charges in a single direction
If a lightning strike carrying roughly 700,000,000 V of electricity were to strike a human with roughly 80,000 Ω of resistance, how much current passes through the victim?
8750 A
What is Ohms Law?
The relationship between resistance, current, and voltage is known as Ohm’s law: V = I x R
What is Voltage?
The Potential Difference
What is a Mixed circuit?
- Contains both Series and Parallel sections
- The brightness is the same throughout the lights
What is an Electric circuit?
An electric circuit is a closed path that electric current can follow
Household circuits in the United States commonly run on 120 volts of electricity. Circuit breakers are installed that open a circuit (and therefore cut the flow of electricity) if it is drawing more than 15 amps of current. What is the minimum amount of resistance that must be present in the circuit to prevent the circuit breaker from activating?
8 R