Check Test
1 Ohm was a school teacher of what nationality?
a English.
German.
2 Ohm was more successful than others investigating electric current because....
... he used a thermocouple as a source of EMF.
3 Ohm's law is....
... true for metals at constant temperature.
4 Which of the circuits has all meters connected in the appropriate places.
5 The combined resistance of two 2.0 W resistors in parallel followed by a single 2.0 W resistor in series is ...
... 3.0 W
6 The series resistance of a digital Volt meter could be approximately....
... 5x107 W
7 A digital Ohm meter does not have....
... a high series resistance.
8 The voltage across two 1.5 W resistors in parallel that are carrying a total current of 12 Amps is....
... 9 V
9 The internal resistance of a 1.5 volt battery that delivers 1.5 Amps when short circuited is ...
...1.0 W
10 Kirchhoff's laws apply to....
... all circuits at all times.
11 Conventional current is....
... a flow of positive charge.
12 The symbols we use for circuit components ...
... are often stylized drawings of original components.
13 Two light bulbs have filaments made from coiled uniform tungsten wires of resistance R1 and R2. Filament 1 is twice as long and twice the diameter of filament 2.
The ratio R1/R2 is....
... 0.5
14 The conducting plates have a cross sectional area of 1 square meter. The potential difference is 200 Volts. The resistivity of air is 2x1015 Ohm meters.
The resistance between the plates is ...
... 4x1013 Ohms
15 The current flowing between the plates in question 12 has a value of ...
The force on the charge is....
... 5 x 10-10 Amps downwards
16 An electric field is set up in a shallow tank of salt water.
The electric current flowing per square cm between two parts of the tank can best be found by....
... finding the potential difference with a digital volt meter and calculating the current using the known resistivity of the solution.
17 The electric field strength across a uniform resistor of 100 Ohms, which is 5.0 cm in length, and is carrying a current of 0.1 Amps is....
... 200 V/m
18 The heat dissipated per second in a resistor is measured in....
... Watts.
19 The power delivered by a battery of voltage V placed across a resistor of R Ohms is best found using....
... P = V2/R
20 Which of the resistors in the circuit shown develops the most heat per second?
21 The power dissipated in a resistor of 100 Ohms when connected to a 50 Volt supply is....
... 25 Watts
22 The elements of a stove are identical. They are connected as follows....
A one element
B two elements in series
C two elements in parallel
Which statement is correct?
The settings are B A C = low medium high.
23 The letters rms refer to....
... the average value of a AC current squared.
24 The rms value of a sine wave current with a peak value of 10 Amps is closest to....
... 7.0 A
25 The power formula for AC currents is....
... Irms2R
You may find it helpful to print this test