UNIT TEST B
Electric circuits and electronics
Name: ___________________________________________ Course: _____ Date: _______
1. Make calculations to complete the following table:
Rt I3
VA-B I4
VB-C PR1
VA-C PR2
I1 PR3
I2 Pbattery
2. For the circuit below, position the voltmeter and ammeter to measure VA-B, and an
ammeter to calculate I3. Explain how to measure R1.
PHOTOCOPIABLE MATERIAL / © Oxford University Press España, S. A.
UNIT TEST B
Electric circuits and electronics
3. Draw a circuit diagram, using the correct symbols, for a circuit that can change the
direction a motor rotates i.e. clockwise and anti-clockwise. The materials available to you
include: 2x 1.5V batteries, 1 double switch, 1 motor of 3V and wire.
4. Complete the following table for an electric heater:
COMPONENT FUNCTION EFFECT
To introduce air into the Electromagnetism
interior
Heating element (metal Heat
wire coil)
Thermistor Heat
PHOTOCOPIABLE MATERIAL / © Oxford University Press España, S. A.
UNIT TEST B. Answer key
Electric circuits and electronics
1. Make calculations to complete the following table:
2. For the circuit below, position the voltmeter and ammeter to measure VA-B, and an
ammeter to calculate I3. Explain how to measure R1.
To measure R1: disconnect the battery, remove R1 from the circuit and reconnect it to the
multimeter separately. On the multimeter select 2 kΩ and place the probes in the Ω and COM
ports.
To measure VA-B: On the multimeter select DC and choose the scale 20 V. Place the probes in V
and COM. It must be connected in parallel.
To measure I2: On the multimeter select 2 mA and place the probes in mA or µA and COM. It
must be connected in series.
3. Draw a circuit diagram, using the correct symbols, for a circuit that can change the
direction a motor rotates i.e. clockwise and anti-clockwise. The materials available to you
include: 2x 1.5V batteries, 1 double switch, 1 motor of 3V and wire.
PHOTOCOPIABLE MATERIAL / © Oxford University Press España, S. A.
UNIT TEST B. Answer key
Electric circuits and electronics
4. Complete the following table for an electric heater:
COMPONENT FUNCTION EFFECT
Motor To introduce air into the Electromagnetism
interior
Heating element (metal To increase the Heat
wire coil) temperature of the air
that circulates inside the
heater
Thermistor To stop the function of Heat
the heater when the
temperature gets too
high
PHOTOCOPIABLE MATERIAL / © Oxford University Press España, S. A.
