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+T0A – Power circuits and hazards: hazardous voltages, fuses and circuit breakers, grounding, electrical code compliance; Lightning protection; Battery safety 
+
+- [[T0A01]] (B)
+Which of the following is a safety hazard of a 12-volt storage battery? #card
+	- A. Touching both terminals with the hands can cause electrical shock
+	- B. Shorting the terminals can cause burns, fire, or an explosion
+	- C. RF emissions from a nearby transmitter can cause the electrolyte to emit poison gas
+	- D. All these choices are correct
+
+- [[T0A02]] (D)
+What health hazard is presented by electrical current flowing through the body? #card
+	- A. It may cause injury by heating tissue
+	- B. It may disrupt the electrical functions of cells
+	- C. It may cause involuntary muscle contractions
+	- D. All these choices are correct
+
+- [[T0A03]] (B)
+In the United States, what circuit does black wire insulation indicate in a three-wire 120 V cable? #card
+	- A. Neutral
+	- B. Hot
+	- C. Equipment ground
+	- D. Black insulation is never used
+
+- [[T0A04]] (B)
+What is the purpose of a fuse in an electrical circuit? #card
+	- A. To prevent power supply ripple from damaging a component
+	- B. To remove power in case of overload
+	- C. To limit current to prevent shocks
+	- D. All these choices are correct
+
+- [[T0A05]] (C)
+Why should a 5-ampere fuse never be replaced with a 20-ampere fuse? #card
+	- A. The larger fuse would be likely to blow because it is rated for higher current
+	- B. The power supply ripple would greatly increase
+	- C. Excessive current could cause a fire
+	- D. All these choices are correct
+
+- [[T0A06]] (D)
+What is a good way to guard against electrical shock at your station? #card
+	- A. Use three-wire cords and plugs for all AC powered equipment
+	- B. Connect all AC powered station equipment to a common safety ground
+	- C. Install mechanical interlocks in high-voltage circuits
+	- D. All these choices are correct
+
+- [[T0A07]] (D)
+Where should a lightning arrester be installed in a coaxial feed line? #card
+	- A. At the output connector of a transceiver
+	- B. At the antenna feed point
+	- C. At the ac power service panel
+	- D. On a grounded panel near where feed lines enter the building
+
+- [[T0A08]] (A)
+Where should a fuse or circuit breaker be installed in a 120V AC power circuit? #card
+	- A. In series with the hot conductor only
+	- B. In series with the hot and neutral conductors
+	- C. In parallel with the hot conductor only
+	- D. In parallel with the hot and neutral conductors
+
+- [[T0A09]] (C)
+What should be done to all external ground rods or earth connections? #card
+	- A. Waterproof them with silicone caulk or electrical tape
+	- B. Keep them as far apart as possible
+	- C. Bond them together with heavy wire or conductive strap
+	- D. Tune them for resonance on the lowest frequency of operation
+
+- [[T0A10]] (A)
+What hazard is caused by charging or discharging a battery too quickly? #card
+	- A. Overheating or out-gassing
+	- B. Excess output ripple
+	- C. Half-wave rectification
+	- D. Inverse memory effect
+
+- [[T0A11]] (D)
+What hazard exists in a power supply immediately after turning it off? #card
+	- A. Circulating currents in the dc filter
+	- B. Leakage flux in the power transformer
+	- C. Voltage transients from kickback diodes
+	- D. Charge stored in filter capacitors
+
+- [[T0A12]] (B)
+Which of the following precautions should be taken when measuring high voltages with a voltmeter? #card
+	- A. Ensure that the voltmeter has very low impedance
+	- B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
+	- C. Ensure that the circuit is grounded through the voltmeter
+	- D. Ensure that the voltmeter is set to the correct frequency