Riddles
Ohm's Law
Components of Circuits
Series Circuits
Parallel Circuits
100
I pull objects down to the ground, and though you can’t see me, I’m always around. What am I?
Gravity
100
What is the formula to solve for voltage?
V = I x R
Voltage = Current x Resistance
100
The power in a battery is measured in what unit?
Volts
100
What is the formula for calculating total resistance in a series circuit?
R(T) = R1 + R2 + R3...
100
What is the formula for calculating total resistance in a parallel circuit?
1/R(T) = 1/R1 + 1/R2 + 1/R3...
200
I am not alive, but I grow; I don’t have lungs, but I need air; I don’t have a mouth, but water kills me. What am I?
Fire
200
If the current in a circuit stays the same but the resistance is increased, what will happen to the voltage?
Voltage will increase
V = I x R
(2)V = I x (2)R
200
What component of a circuit can turn it on / off?
Switch
200
What is the total resistance of this circuit?
23Ω = 13Ω + 6Ω + 4Ω
R(T) = R1 + R2 + R3...
200
What happens to total resistance in a series when you add a resistor in parallel?
Total resistance decreases
300
I have a tail, but no body. I have a head, but no body. What am I?
Coin
300
A circuit has a 9V battery, and a 3Ω Resistor. What is the current?
3A = 9V / 3Ω
I = V / R
300
Why would a switch work best on a series circuit, instead of a parallel circuit?
The switch controls the current in a series circuit. In a parallel circuit, there is another path for the current so it is not effective.
300
What is the total resistance of this circuit?
6Ω = 4Ω + 2Ω
R(T) = R1 + R2...
300
What is the total resistance in this circuit?
1/R(T) = 1/4 + 1/2
1/R(T) = 1/4 + 2/4 = 3/4
3/4 -> 4/3 = R(T) = 1.33Ω
400
I live in the sky but fall to the ground. I’m cold and white and make no sound. What am I?
Snow
400
A circuit has a current of 2A, and a voltage of 9V. What is the resistance?
4.5Ω = 9V / 2A
R = V / I
400
In a 9V battery that has many electrons within it, how many volts are in a single electron?
9 Volts
400
What is the current through the circuit? (Find total resistance first)
2A = 12V / (4Ω + 2Ω)
I = V / R
400
What is the current running through this circuit? (Find total resistance first)
9A = 12V / 1.33Ω
I = V / R
500
What has hands and a face, but can’t hold anything or smile?
Clock
500
A circuit has resistance of 27Ω, and a current of 22A. What is the voltage?
594V = 27Ω x 22A
V = I x R
500
Name the 2 devices that measure voltage and current
Voltmeter and Ammeter
500
What is the current through the first resistor?
10A = 20V / 2Ω
I = V / R
500
What is the current running through this circuit? (Find total resistance first)
12A = 12V / 1Ω
I = V / R