Circuit Fundamentals
Ohm's Law
Series vs. Parallel
Power in a Circuit
Faraday's Law
100
Fill in the blank:
Opposite charges _____________
Same charges ____________
Attract, repel
100
Is the circuit below series of parallel?
Parallel
100
How much current passes through a lightbulb with 110 Volts and 10 Ohms of resistance
11 Amps
200
What are atoms made of?
Protons, neutrons, and electrons
200
Ohm's Law tells you how to find the current in a circuit given voltage and resistance. What is Ohm's law as an equation?
I=V/R
200
What is the resistance of the circuit below?
125 Ohms
200
What equation tells you the power in a circuit?
P=IV
300
What is electric current?
Moving charges such as electrons
300
A power saw at the local hardware store boasts of having a 15-Amp motor. Determine its resistance when plugged into a 110-Volt outlet.
7.3 Ohms
300
What is the difference between a series and a parallel circuit?
Series circuits follow one path or loop in which the current must travel. Parallel circuits have multiple paths or loops the current can travel through.
300
A 100 Watt bulb runs off a 110 Volt outlet. What is the current in the wire?
0.91 Amps
300
Fill in the blank:
A changing _____________ creates a ______________
Magnetic field, electric current
400
Why don't open circuits carry an electric current?
Circuits need closed loops for the electrons to constantly move through.
400
Defibrillator machines are used to deliver an electric shock to the human heart in order to resuscitate an otherwise non-beating heart. It is estimated that a current as low as 17 mA through the heart is required to resuscitate. Using 100,000 Ω as the overall resistance, determine the output voltage required of a defibrillating device.
1700 Volts
400
What is the voltage in the second resistor of the circuit below?
10 Volts, voltage is the same for every path of a parallel circuit
400
100 amps run through a massive speaker with 10 Ohms of resistance. How many watts are passing through the speaker?
10,000 Watts
400
Why does a moving magnet in a copper coil creates an electric current?
The magnet forces the electrons in the copper coil to move
500
To carry a current, a device needs to connect to a circuit in two places. How do the computer chargers carry a current if they only plug in in one spot?
The plugs have two separate pieces of metal, one gives current and the other takes current.
500
Find the voltage in the left resistor
1.67 V
500
What is the current in the circuit below?
23.13 Amps
500
The UL panel on the bottom of an electric toaster oven indicates that it operates at 1500 W on a 110 V circuit. Determine the electrical resistance of the toaster oven.
8.1 Ohms
500
Why does a magnet fall slower through a copper pipe than through the open air?
The falling magnet creatures a current in the rod that pushes against the falling magnet.