Helpful Formulae;
V = I x R where V is voltage, I is current, and R is resistance
Effective resistance in parallel = (R1 x R2) / (R1+ R2)
Effective resistance in series = R1 + R2
133. Electric current can be measured with what instrument?
(a) Micrometer
(b) Voltmeter
(c) Ohm meter
(d) Spectroscope
(e) Ammeter
134. Which of the following components is required in an electric circuit?
(a) Source of electrical power
(b) Load
(c) Conducting path
(d) Switch
(e) a, b, and c
135. A resistor is measured to be 0.17 kilo-ohms. How many ohms is this?
(a) 1700 ohms
(b) 170 ohms
(c) 17,000 ohms
(d) 0.017 ohms
(e) 0.0017 ohms
136. A 2.0 Amp current is flowing through a 300 ohm resistor. What is the voltage across the resistor?
(a) 60 volts
(b) 1.5 volts
(c) 600 volts
(d) 150 volts
(e) zero volts
137. The Ohm is the unit of:
(a) Electrical Resistance
(b) Electric Power
(c) Electric Current
(d) Electric Charge
(e) None is correct
138. The current flowing through a resistor connected to a 9 volt battery is 9 amps. What is the value of the resistor?
(a) 0.081 ohms
(b) 10 ohms
(c) 18 ohms
(d) 1 ohm
(e) 81 ohms
139. When a 24 volt battery is connected to a 120 ohm resistor, the current flowing through the
resistor is:
(a) 0.002A
(b) 0.02A
(c) 0.2A
(d) 2A
(e) 20A
140. A current of 3.0 milliamps is equal to how many amps?
(a) 3,000,000 (A)
(b) 300 (A)
(c) 0.30 (A)
(d) 0.03 (A)
(e) 0.003 (A)
141. When a 700 ohm resistor is connected to a 1500 ohm resistor in series, the effective resistance is:
(a) 850 ohms
(b) 2000 ohms
(c) 2200 ohms
(d) .0022 ohms
(e) zero ohms
142. Two measurements are made of the current in an electric circuit. One accepted measurement is 51 mA;
the experimental measurement is 50 mA. What is the percentage error between the measurements?
(a) 0.02%
(b) 2%
(c) 1%
(d) 20%
(e) 101%
143. If you wish to measure the current flowing through a resistor, how do you connect the meter?
(a) connect the black wire to the positive side and the red wire to the negative side of the resistor
(b) connect the red wire to the positive side and the black wire to the negative side of the resistor
(c) connect only the red wire to the middle of the resistor
(d) connect the meter in parallel with the resistor in the circuit
(e) connect the meter in series with the resistor in the circuit
144. What does the 20 Volt scale on the multi-meter mean?
(a) The meter is producing an electrical potential of 20 volts
(b) The minimum voltage that can be measured is 20 volts
(c) The maximum voltage that can be measured is 20 volts
(d) Add 20 volts to the meter reading
(e) The meter is producing 20 amps
145. When a 500 ohm resistor is connected to a 1500 ohm resistor in parallel, the effective resistance is:
(a) 0.33 ohms
(b) 2000 ohms
(c) 1000 ohms
(d) 375 ohms
(e) 4000 ohms