Calculations
Current Electricity
Voltage and Current
Resistance
Power & Circuits
100
Calculate the current flowing through a circuit if 367800 C flows through it in 24 hours..
4.23 A
100
In electron flow model of current electricity, which type of charges move, and in what direction?
Electrons, from negative to positive.
100
What are the units of potential difference?
Volts
100
What is resistance?
Degree to which a substance opposes the passage of an electric current
100
What equation defines the rate of doing work (Power)
P = IV / P = IXV
200
Only 0.0050 A of current can pass through a DVD player. If the dvd player is operated by a 12 V battery, what is the resistance within the circuit?
2400 ohms
200
What object is represented by the circuit symbol below? 
An ammeter
200
How are voltmeters connected in a parallel circuit?
Across a load/source
200
Resistance changes in series and parallel circuits. Which type of circuit has a higher resistance?
Series circuit
200
Give the Series Circuit formulas for Current, Voltage and Resistance..
IS = I1 = I2 = I3 = ……….. IN
VS = V1 + V2 + V3 + …… + RN
Rs = R1 + R2 + R3 + ........ RN
300
In a portable radio, 1 A of current is flowing through a conductor that provides 20 Ω of resistance. What potential difference is provided by the battery?
20 v
300
Which conductor is the best choice for wiring circuits?
Copper
300
How many milliamperes are in one ampere?
1000
300
If a load measures a voltage of 4V and has 0.2A of current running through it, what is the resistance of the load?
20 Ohms
300
Give the Parallel Circuit formulas for Current, Voltage and Resistance..
Ip = I1 + I2 + I3 + ………..IN
Vp = V1 = V2 = V3 = …… RN
1/Rp = 1/R1 + 1/R2 + 1/R3 + 1/RN
400
Four loads (6 Ω, 10 Ω, 15 Ω, 25 Ω) are connected in series to a 15 V battery. Calculate (1) the equivalent resistance; (2) The total current; (3) The voltage across each resistor.
Rs = 56 Ω
Is = 0.27 A
V1 = 1.62 v
V2 = 2.7 v
V3 = 4.05 v
V4 = 6.75 v
400
Give the equation known as Ohms Law...
V = IXR / V=IR
400
The voltage of bulbs in a series circuit are 1.5V, 0.8V, and 1.2V. What is the voltage of the source?
3.5V
400
A lightbulb has a current of 600mA and a resistance of 110 ohms. What voltage would be measured across the lightbulb?
66 Volts
400
What stays the same in a series circuit?
Current (Amps)
500
Four loads (6 Ω, 10 Ω, 15 Ω, 25 Ω) are connected in parallel to a 20 V battery. Calculate (1) the equivalent resistance; (2) The total current; (3) The current across each resistor.
Rp = 2.68 Ω
Ip = 7.46 A
I1 = 3.33 A
I2 = 2 A
I3 = 1.33 A
I4 = 0.8 A
500
What type of circuit is shown below? 
Parallel circuit
500
The current on the main branch of a parallel circuit is 12A. If the first branch of the circuit measures a current of 9.5A, what is the current on the second branch?
2.5 A
500
Are loads resistors?
Yes
500
What stays the same in a parallel circuit?
Voltage/Potential difference (volts)