Ohm's Law Revision

Revision of Ohm's Law. An electrical circuit consists of 3 quantities - voltage, current and resistance. These quantities are the basis of Ohm's Law. Using two known quantities the third unknown quantity can be found. When the quantites being measured are very large or very small prefixes are used. Potential difference is the difference in voltage between any two points. All voltages being measured in a circuit are referenced to a common ground point.

Make sure you know it all! Any basic elecrical or electronic circuit consists of three seperate but very much related quantities, Voltage (V), Current (I) and Resistance (R).

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1. What is the formula to find the value of voltage?
I x R
V / R
V X I
V / I
V2 / R
I2 x R
2. What is the formula to find the value of Current?
I2 x R
V2 / R
V x I
V / R
V / I
I x R
3. What is the formula to find the value of Resistance?
V / I
V / R
I x R
V x I
4. If Voltage is 24v and (I) is 2amps, what is the value of P?
40
48
45
43
5. If Voltage is 24v and I is 2amps, what is the value of R?
12ohms
12watts
12volts
48ohms
48watts
48volts
6. If V=8, R1=10ohms, R2=15ohms. Find R total.
25ohms
25watts
25volts
50ohms
50volts
50amps
7. If V=8, R1=10ohms, R2=15ohms. Find total current.
0.30amps
0.30volts
0.31amps
0.31volts
0.32amps
0.32watts
8. If V=8, R1=10ohms, R2=15ohms. Find voltage across R2.
4v
4amps
4watts
4.8v
4.8amps
4.3v
9. If V=8, R1=10ohms, R2=15ohms. Find the power used by the circuit.
2.56volts
2.56watts
3.56amps
3.56volts
2.65volts
2.65watts
10. if V=16, R1=20ohms, R2=30ohms. Find Rtotal.
40watts
40ohms
50volts
50ohms
60amps
53amps

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