Test on Electric circuit: current, voltage and resistance

Question 1: The schematic symbol for an open switch is represented by a circle with the letter 'A' inside.

A. Yes

B. No

Explanation: The study materials define the schematic symbol for an open switch as 'A break in the line with a diagonal line connecting one side to a pivot'. A circle with the letter 'A' inside is the schematic symbol for an ammeter, not an open switch.

Question 2: According to the provided study materials, which description accurately identifies the schematic symbol for a battery (DC Voltage Source)?

A. A circle with a cross inside, representing a light bulb.

B. A zigzag line, which symbolizes a resistor.

C. A series of long and short parallel lines, with the longer line representing the positive terminal.

D. A circle with the letter 'A' inside, indicating an ammeter.

Explanation: The study materials explicitly state that the schematic symbol for a Battery (DC Voltage Source) is 'A series of long and short parallel lines, with the longer line representing the positive terminal.' The other options describe symbols for a light bulb, a resistor, and an ammeter, respectively.

Question 3: When measuring the current flowing through a particular component, an ammeter must be connected in parallel with that component.

A. Yes

B. No

Explanation: To measure the current flowing through a particular component or section of a circuit, the ammeter must be connected in series with that component.

Question 4: According to the study materials, which statement accurately describes the function and connection of a voltmeter in a circuit?

A. It measures electric current and is connected in series with the component.

B. It measures electric potential difference and is connected in parallel with the component.

C. It measures electric current and has very high internal resistance.

D. It measures electric potential difference and is connected in series with the component.

Explanation: A voltmeter measures electric potential difference (voltage) across two points in a circuit. To measure the voltage across a component, the voltmeter must be connected in parallel with that component.

Question 5: One Watt is defined as one Joule of energy per second.

A. Yes

B. No

Explanation: The study materials state, 'One Watt is defined as one Joule of energy per second (1 W = 1 J/s).'