ET 26103

A 50 ohm resistor and a 75 ohm resistor are connected in PARALLEL. What is the TOTAL resistance of these two resistors?

• 10 ohms

• 20 ohms

• 30 ohms

• 40 ohms

Answer explanation

Multiply both resistor values.

EX: 50 ohms x 75 ohms = 3,750 ohms

Add both resistor values.

EX: 50 ohms + 75 ohms = 125 ohms

Divide the 3,750 ohms by 125 ohms

EX: 3,750 ohms/125 ohms =

Total Resistance of 30 ohms

The color silver in the 4th band place on a resistor represents a tolerance of _____.

• • + or - 5%

• • + or - 10%

• • + or - 15%

• • + or - 20%

If two 5 ohm resistors are connected in SERIES, what is the TOTAL resistance?

• 2.5 ohms

• 5 ohms

• 10 ohms

• 25 ohms

Answer explanation

When trying to find the resistance in a series circuit you simply add the resistance of each load/resistor in that circuit.

EX: 5 ohms + 5 ohms = 10 ohms

In a PARALLEL circuit, which is true about voltage drop?

• it is the same across all loads

• its divided between the loads

• it depends on the resistance of the load

• it is converted to the equivalent series load and added together

An Ohmmeter is uses to measure what?

• volts

• resistance

• current

• joules

If the resistance of a circuit is 5 ohms and the current is 5 amps, what is the power in watts?

• 5w

• 25w

• 125w

• 250w

Answer explanation

Using the expanded Ohms Law wheel, find the formula for power in watts.

i Squared x R or Amps Squared x Resistance=

Power in Watts

EX: 5x5=25amps

25amps x 5ohms = 125watts

What is the applied voltage if the current in a circuit is 48A and the resistance is 10ohms?

• .208v

• 4.8v

• 208v

• 480v

Answer explanation

Using the simplified Ohms Law wheel use the formula to find voltage.

E= I x R or Voltage= Current x Resistance

48A x 10 Ohms = 480 volts

What is the circuit current if the voltage source is 120V and the resistance is 10 Ohms?

• 12A

• 24A

• 240A

• 1200A

Answer explanation

Using the simplified Ohms Law wheel use the formula to find Current.

Current = Voltage/Resistance or

I= E/R

120V/10 ohms = 12Amps

What is the applied voltage of a circuit that has 10 amps of current and 6 ohms of resistance?

• 1.2v

• 12v

• 60v

• 120v

Answer explanation

Using the simplified Ohms Law wheel find the formula for determining voltage.

Voltage = Current x Resistance or V= I x R

10A x 6 ohms = 60 volts

Which of these material is considered a semiconductor?

• silver

• silicon

• copper

• platinum